ask them where something is when ur standing right in front of it...
ask them for money and use the money to buy something from there または say あなた will pay them back and when they give あなた the money run out of the store...
follow them around without saying a word
run around the store screaming
hug every employee that works there
tell them they smell bad
tell them to get real jobs (no offense to anyone who works there)
heres what あなた do: あなた buy a condom, a hangar, a carrot, and a spatula, and just stare at them while they ring up the items. the look on their face is gold!