How do you entertain on a plane?

Some ways to entertain yourself on a plane include:

-Bringing a book, magazine, or other reading material.
-Listening to music or podcasts.
-Playing a game on your phone or tablet.
-Doing a crossword puzzle or other brainteasers.
-Watching a movie or TV show.
-Writing in a journal.
-Doing some light stretching or yoga.
-Talking to your seatmate.
-Sleeping.