Squirrel.

I'm trying to do my homework, get it done fast, you know? Well, there's this squirrel that passes on the fence back and forth, back and forth. It's driving me crazy! It's in that spot of my peripheral vision where you turn and you immediately think, "What was that?"
Well, this squirrel has been doing this to me for the past five minutes and I feel like the dog from Up going, "Squirrel... Squirrel..."