In a video store (blockbuster to best buy) take porno videos and put them in the kiddy sections.
Go to the TV section and swap out all the remotes.
Open all the fridges and steal (just relocate to a different part of the store) all the fake food
Bring beach balls and throw them around, or if they have a toy department take those and throw them around.
If they have bikes in the store take them for a ride.
Call a random number, maybe a store and say Hello, this is (name here) How may I help you
Go out somewhere and Sing everything instead of just talking.

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