In the Drake & Josh episode "The Bet," the part when in Human Science class and on the board the teacher has drawn a circle. Then Josh drifts into a daydream, and when you look back there are suddenly more than one circle! Then, you come back again and there is only one circle again!!
Maybe he drew the second circle during the first daydream, then realized it shouldn't be there and erased it during the second?
My teachers do things like that all the time.
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