Squirty creem = drugs - well, sortof

The propellent in whipped cream cans is indeed N2O (Nitrous oxide, a mild anaesthetic), but it's a terribly inefficient and wasteful way of getting high. You get maybe one or two lungfuls from a whole can, and a slight tingly buzz that lasts less than a minute. Hyperventilating is more exciting than that. Unless you /really/ like cream.