I got caught and have caught many since.
My own dad when i first started pub attendance got me with the bottle trick like a good `un.

in essence 2 empty bottles and one full of the same size. Sitting down, hold one above the other by the neck and tap the top one down.

Start with 2 empties

"now tap them together and listen, you hear the sound? it doesnt change, now put the full one underneath and listen carefully when you tap them together...."

Wet lap guaranteed, the beer froths out, sometimes as a proper fountain.

( note: extensive later testing seems to indicate the top bottle being empty and the same size matters. You can do it with mixers too. Coke is good, white shield, newky brown or good old light ale all do champagne impressions more often than a dribble)
(tootired Is searching for a funny sig, nothing good so far, Sat 23 Aug 2008, 18:46, Reply)