One of my childhood dogs did the 'bang' trick.
STG, I don't know if this is classified as a trick, but depending on how house training is going, I taught one of our poodle mixes to ring a bell when he has to go outside. I hung a ribbon from the doorknob with two jingle bells attached to the bottom low enough for him to touch them with his nose. When we first brought him home every time we would go to take him out we'd put him close to the bells and he would either touch them out of curiosity or we would give him a nudge. He learned that when the bells rang it meant "outside". He still, at nine months, will ring them every time he has to go out.
Stella - sweet, timid, elegant, lovely, lively, amazing
Luna - large, unattractive, naughty, adored