Funny story time:

I'm a large person.  In boots I stand about 6'3" and I weigh in around 335 mostly firm pounds.  I dress mainly in black and also carry myself pretty confidently and have been accused on occasion of being "a scary biker type".  I don't try to be scary but it happens.  Oh, and my main ride is a 1998 Honda Valkyrie.

On one particular Saturday afternoon after a long and satisfying ride to nowhere, I walk of a local burrito purveyor and spot a group of teenagers skateboarding in the empty parking spaces near my bike.  As I get closer I notice that one of them is leaning on the high side of the Valk's seat.  

I make my way to low side of the bike and without warning I simply ask "Boy, what in the HELL do you think you are doing?"  I have never seen a skinny little punk move so fast in my life.  I laughed all the way home.