I like this idea from Instructables–an Anti-Boredom kit for waiting in lines, doctor’s offices, church, and other less-than-thrilling situations. It seems like it would be especially useful if you have kids. In the kit:

-Tiny deck of cards
-Small vile of touchable bubbles
-Two tubes of plastic bubbles
-Tiny colored pencils
-Note pad
-String for cats cradle
-Quarter to vend treats (a dollar fits nicely too for bigger treats)
-Balloon (for playing don’t touch the ground or keep away)

I am surprised all that fits in one Altoids tin! (Via Craft)