Thinking things can get really annoying. Especially if you're like me and you replay every cringeworthy situation in your head until you feel like crawling into a hole and burying yourself with dirt with hopes of one day blossoming into a flower...maybe. It's like needing to scratch your head but you can't because you need both hands to carry really heavy bags. And so you must suffer that discomfort until you can drop the bags and scratch your head. The point is, it sucks.
And so I hum. I hum until my thoughts get drowned by the sound of my humming. But then you get tired of humming and the thoughts come up again and so you hum louder and I guess you repeat until you pass out from exhaustion or something.