An interesting thought! I have the same problem regularly with watering cans, so once I've drained it (after its good kicking!) I'll certainly check for a snail.
I've only just noticed all the latest replies from Alan4711 (are you from Cologne by any chance, or are you just sweet-smelling?), Topbird, Hibsrpish and John Colquhoun(do share your insight into Hibsrpish's name). Thank you.
Blowing might work once it's drained, though I'll have to lie prostrate to do it. Still, it'll give the neighbours a laugh.
How about I make a video of yours truly attempting all solutions : unscrewing / swearing / kicking / swearing / setting beer snail traps / swearing / prostrate-blowing / swearing...... now that might go viral !
Only joking, of course just in case you got excited! But I shall post the result of my labours, once completed, when the weather breaks.
If you do decide to empty the waterbutt you don't need to use a jug. I would be inclined to try siphoning it out with a length of hosepipe, (easiest with two people)
Fill the hosepipe with water first
block both ends (corks or thumbs)
drape one end at ground level
Hold the other end under the water
Open both ends keeping the one in the barrel always covered with water and higher than the one on the floor
If you have some other large containers handy you can catch your water in those, but remember that as the water level rises in the 'catching' container it will slow down the siphoning until the level is the same in both containers.
I use this method to link my two water butts together so I only need to visit the more easily accessible of them
Of course, you might not have wanted to know all that I'll stop gushing now!
Oh, I meant to say - in all seriousness - take care if you do attempt to blow the tap clear: there will be a considerable pressure from gravity working on the entire weight of water in the barrel...probably too much for your lungs to work against...
but if it does clear, then all that weight of water will try to empty into you - unless you keep your end of the tube above the end that is in the waterbutt.
Place the end of the hose pipe (not too long a length, just enough to reach the bottom of the butt, and down to the ground on the outside) in the water butt. Suck water through it. Just before the water reaches your mouth seal the end of the pipe with your thumb and take the pipe down to the ground and water should siphon out of it.
When the siphon is going well you can make sure the pipe goes as low in the water as it will without the siphon stopping. You'll be able to tip the butt to get the last water out easily.
To avoid sucking in butt water (that sounds truly horrible) you can fill the length of hose pipe with water at the tap. Keep a thumb over the ends, place one end in the butt and the other end at the lower level and remove thumbs, it will syphon as if by magic with no chance of a mouth full of grim water and no hose pipe taste in the mouth.
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Thinks HIBSRPISH (Just realised your nickname lol)message is the best idea, and quicker
An interesting thought! I have the same problem regularly with watering cans, so once I've drained it (after its good kicking!) I'll certainly check for a snail.
Thank you
WOW !
I've only just noticed all the latest replies from Alan4711 (are you from Cologne by any chance, or are you just sweet-smelling?), Topbird, Hibsrpish and John Colquhoun(do share your insight into Hibsrpish's name). Thank you.
Blowing might work once it's drained, though I'll have to lie prostrate to do it. Still, it'll give the neighbours a laugh.
How about I make a video of yours truly attempting all solutions : unscrewing / swearing / kicking / swearing / setting beer snail traps / swearing / prostrate-blowing / swearing...... now that might go viral !
Only joking, of course just in case you got excited! But I shall post the result of my labours, once completed, when the weather breaks.
Thank you all,
Naki
That's me done then!
If you do decide to empty the waterbutt you don't need to use a jug. I would be inclined to try siphoning it out with a length of hosepipe, (easiest with two people)
Of course, you might not have wanted to know all that
I'll stop gushing now! 
Oh, I meant to say - in all seriousness - take care if you do attempt to blow the tap clear: there will be a considerable pressure from gravity working on the entire weight of water in the barrel...probably too much for your lungs to work against...
but if it does clear, then all that weight of water will try to empty into you - unless you keep your end of the tube above the end that is in the waterbutt.
Place the end of the hose pipe (not too long a length, just enough to reach the bottom of the butt, and down to the ground on the outside) in the water butt. Suck water through it. Just before the water reaches your mouth seal the end of the pipe with your thumb and take the pipe down to the ground and water should siphon out of it.
When the siphon is going well you can make sure the pipe goes as low in the water as it will without the siphon stopping. You'll be able to tip the butt to get the last water out easily.
Really helpful Birdy13. I love your pictures. Thank you!
A picture paints a thousand words
Hope you get it sorted - at least at this time of year it won't take long to refill if you have to drain it.
To avoid sucking in butt water (that sounds truly horrible) you can fill the length of hose pipe with water at the tap. Keep a thumb over the ends, place one end in the butt and the other end at the lower level and remove thumbs, it will syphon as if by magic with no chance of a mouth full of grim water and no hose pipe taste in the mouth.