We do absurd things when we don't know what to do with our hands.
From when were talking on our phone, sitting in traffic, or driving, we do and say wierd things. When we get bored or figety enough, our subconscious mind turns into a three year old. Especially in traffic, where your nose picking might accidentally lead to flipping off the chick next to you with that finger. We have strange reactions when we realize people are looking at us, too.
I once stapled my hand while I was on the phone.
Tell us your crazy story where you did, said, ate, or sang something silly almost without control.