The classic example of this is when someone sees you check your watch, then they ask the time, and you have to check the watch again to see what time it actually is. A comment is almost always made about how the watch was just checked.
"Well, surely some time has passed since I read it last...you weren't asking me what time it was the last time I checked, were you?"
"Well, surely some time has passed since I read it last...you weren't asking me what time it was the last time I checked, were you?"