I usually dislike waiting--doctor's offices, bus rides--for many things. Since I get bored quite easily, my mind tends to wander, and I have learned to let it freely go where it wants. Too many times, I'll end up with a smirk on my face...which turns into a snicker...and ends up in little hitches and giggles. This does draw attention. What reins me in is the thought, "Quit it! Now! Before they haul yer *** off to The Ward!" That's not quite the price I want to pay for being terribly amusing to myself.
And yes, if you've wondered, I've been doing this a lot in the Answers section of this site...especially lately.