A funny gag, and a great trick, too!
Hand your spectator a brass canister and a few peas of different colors. Tell the spectator to mentally select one of the peas, then put all of the peas into the canister, sealing it with the cork stopper.
"Wouldn't it be amazing if the only thing that comes out of the canister is your favorite pea?", you ask. You uncork the canister and tip the canister so the contents pours out onto their hand- but instead of a bean pea, out pours warm liquid! (Get it? Your favorite "pee"...). Very funny for the right audience!
Please note: The Pea Can you receive may vary slightly in appearance from what is shown in the photo or demo video.