Authors:

Sometimes when you are trying not to think about something it keeps popping back in your head you can't help it you think about it and think about it and think about it until your brain feels like a squashed pea.

Sharon Creech (2001). “Love That Dog”, p.64, A&C Black
Sometimes when you are trying not to think about something it keeps popping back in your head you can't help it you think about it and think about it and think about it until your brain feels like a squashed pea.