Well, there is the first way, which is basic daydreaming.
But that only happens when I'm relaxed, and in an environment where I feel somewhat safe to do such a thing.
It can kill time, but if there are people there, well, I'll look a little weird/out of place.
For my second option, I go back to my former University classes.
I look over the environment and examine the people, and start to make up stories surrounding them.
If they're talking to someone or in a group, I usually involve them. It can take up a lot of time, so recently I've been trying to do that, especially since my Creative Writing will (hopefully) come to close this year.
Luckily enough, no one will read these stories, unless I want them to.
