When I'm getting undressed, I MUST take my shirt, pants, and socks off in such a way that they don't turn inside out. I can't just pull my shirt off, I have to pull from the neck area so it stays right side out.
If I'm eating M&Ms or something similar, I keep a rough mental count of how many I'm chewing on one side and then try to have the same amount on the other side of my mouth. So if I grab three M&Ms and chew them on the left, I'll then chew three on the right (or four, and then one more on the left). Or I'll divide the number in half in my mouth and send each half to one side.
When I adjust the volume on my car radio, I like to set it to even numbers or multiples of five.