So Michele is talking to me about her upcoming trip today:

Michele: blah blah blah when I return on Tuesday blah blah blah
Me: Huh? Tuesday? You said you'd be back Monday.
Michele: No! It's Tuesday!
(I point at the calendar that I have been instructed to consult daily)
(It clearly shows Monday as the return day)
Me: Um, look at the calendar.
Michele: (exasperated) But the ticket isn't valid on Monday!
Me: Um, OK. So you are coming home Tuesday?
Michele: Yes! Tuesday!
(She then leaves the room to go remake the calendar on her computer)

Again I am at fault for my lack of mind reading skills.