I do the fingers in my ears and hum thing too. I hum if other people are in hearing area, or if i know i'm alone i sing, random words or whatever comes in my head.

Once when i was little, around 7 or 8, i was watching one of the Home Alones and so saw it coming. My mom's new boyfriend was over. I leaped over the both of them and the arm of the couch and FLEW up the stairs, closed my eyes and hummed and cried.

My mom got really embarrassed about me fleeing in front of her new bf. She's never understood it and thought she'd reassure me by telling she had last night and a couple nights ago and its a normal thing.
That soooooooooo didn't help.

I was in college and 2 of my roomies and 3 of their friends got drunk on Vodka. I so got the hell out of there as soon as i could with my blanket and pillow and tried to sleep in the lounge. I realized i had forgotten my keys though. I went back with the only other sober girl, ran in, went straight to my ipod, turned it up, put it in my ears, when one of the girls came into my room yelling 'elizabeths getting sick!" I shouted over my ipod "OHMYGOD CARRIE (sober girl) GET ME THE F*** OUT OF HERE WITHOUT SEEING ANY KIND OF SICKNESS"
I still have no idea how i got out of there.

Fun times :-P