Time warp

Cell phone conversation

Me: Hey, I'm at Sam's and they have some good pies, should I get one?
Tina: What are you doing at Sam's? I thought you were at work?
M: I told you I was taking time off.
T: You said you were taking off Tues and Wed
M: It is Tue
...
T: Oh... yeah. I *thought* it was Monday!