Steve Martin and Alec Baldwin and the switching gag

One of these drinks is Poisoned...

Steve Martin and Alec Baldwin try deceiving each other with the old "switching the poisoned drink gag" on an episode of Saturday Night Live. This gag was likely an old vaudeville routine when Abbott and Costello did it in three different movies.

Here, in just a portion of the entire skit, Martin and Baldwin use the gag, but embellish it with secondary deceptive gags such as Martin having another vial of poison when his first attempt is foiled, or Martin distracting Baldwin while he's trying to clean up the mess from a foaming poison.