and i thought my jokes were bad

I was humming a tune while walking to class the other day when something completely out of the blue occurred. I think I was singing the falsetto part to some song quietly when the guy in front of me turns away and gives me a funny look. You know the kind of look you have when you observe something that boggles your mind, like a guy making his own sandwich or something.

I felt really self-conscious and had a shifty eye moment for a while. Sometimes I forget that people can hear me when I hum. This one time back in third grade, I was humming while waiting in line to go out to recess. All of a sudden, the teacher whips around and asked loudly, "Who is humming?" OH SCHNAP!?! Up to that point in my life, I never knew people could hear me while I hummed. I wasn't familiar with the whole sound waves and physics of the thing. Who knew?

They need to come up with some sort of invisibility cloak for this sort of situation. Crushing blow to my self-esteem. Plus, I need to stop humming embarrassing songs.