Thats a loaded question right? Well, it can be.
One of my colleages, a Web Developer/Technician in his mid 30's... super quiet... we never really talk... comes in after lunch. Stops by my desk and says "how do I look?" I looked up at him thinking "whats different... his hair?". "Is it your hair?" I ask? Yes. "It looks Great! Did you get it cut at lunch?" Yes.
My colleague is nice. Super quiet in everything. You can't hear him walking around the office. He came up to my desk the other week, didn't say a word, just took scissors - I jumped out of my skin!
Then last week I was putting milk in the fridge and a hand appears in the fridge also! "Aaaghhh! don't do that! cough or something, make some noise!"
It reminds me of that episode of Seinfeld - you know the one - where Elaine has this colleague who is super quiet and always creeps up on her. One day she gives him a packet of tic tacs, so they rattle when he is walking around. I related this episode to my colleague who didn't know what I was talking about. Oh well.