Losing Track of Time

I lose track of time when...
I'm at a movie that I like.
I'm trying to amuse myself.
I'm working on a project of my own choosing.
I'm talking to someone on the train.
I come across a line in a book that I like.
I'm sitting on a bench near Columbus Circle and the Care Bears jump out of a van. They hug a few kids then get back in the van. A street musician plays classical guitar music.
I'm doing the Sunday crossword puzzle.
I let thoughts race through my head as I lay in bed.
I'm trying to swat a fly.