On the weekend we had relatives over. My 5 year old niece was having fun, running up and hitting me when i wasn't looking and running away giggling. So I said to her "Whatever you do, don't hit me on this shoulder" (pointing to my left shoulder. I happen to have a whopping ugly scar there from surgery years ago. So of course, my niece runs up and hits me in the shoulder and runs away giggling. I lift my shirt sleeve, moaning and groaning and show her my scar. I've never seen somebody's face change so quickly. Poor thing really thought she had wounded me badly. I had to quickly re-assure her.
It was pretty funny.