I inevitably worry about my papers. I obsess over perfection and then never finish the paper on time, ruining my grade. It makes no sense to do this, but I do it anyway.
To make matters worse, even when I wait until the last minute and then turn in a shoddy and poorly edited job, more often than not my professors will tell me it's a good paper and wonder why it took so long to actually get started on it.
I do things that make no sense. It bothers me sometimes. :\