That's a great idea!
well, acording to me:

1) COMON
-flicking the lights on and off.
-checking my hands, by counting fingers and staring at them front to back, a few times.
-looking up on the roof at home, or outdoors by loking at the sky, clouds for sure!
-looking at the time or reading any sign with letters or pictures. (at times I try to make it change with the mind).
-every time seeing #3 of anything, a must for me! whats your number?

2) UNCOMON
- Hearing a sound 3 times
- getting hit by an animal
- checking at a sign in my car "am I dreaming?" every time I go in and out

...Hmmm? I thought this would be easy.. got to do those RCs with tasting, feeling, doing something..etc.

Thank for this!