The only thing I don't like about the trick, is that at the end I want to drink the soda, but its kinda nasty to drink it after a quarter has been in there.

and since your borrowing it who knows where its been.

Otherwise the effect is hard to beat, and the method is pretty clever.

borrow everything
no setup
no reset
marked coin
coin is heard inside can
spectator can pour out liquid
spectator can examine and keep everything
you need nothing

pretty hard to beat those conditions