Sharp as a tack

Me: What time does the shop close?
Girl: 10PM
Me: What time does it open?
Girl: 8AM
What time does Jusco close?
Girl: 10PM
What time does 7-11 close?
Girl: 10.... hey!

Sometimes you can catch them off guard. But the staff in the office? They would look at you blankly and ask you to repeat the question again and again, thus taking the edge off the joke.

Renovating or closing down?
This 7-11 outlet has closed doors since 20.12.2005