A food related April's Fools day joke for your enjoyment.
It's early, but we must plan ahead.
Everyone knows those peanut brittle cans will have spring loaded snakes that jump out when you open the can.
Get a can of those and remove the snakes. Replace them with real peanut brittle. They'll flinch and look away when they open it..and you say "what's the problem, it's just peanut brittle"
After a couple of weeks they'll be conditioned to expect the peanut-brittle. Then replace the snakes.