Self-inforced habits

I take stairs two at a time as well (just not always), but mostly because i have really long legs from being 6 feet 3 inches tall.

When eating certain foods, I will either chew an equal amount of times on both sides of my mouth. Sometimes though, I will just take a bite, chew on one side, swallow, then take the next bite and chew on the opposite side. Rinse and repeat.

Same reason here, but im the only one of my group of friends who does it.

This is a weird one, although not a habit. I dont eat stuff with the consistency (or similar) of mashed potatoes