The kind bullshit that makes me extract a value from a cache I just calculated just to make sure it is working.
Last week I spent three hours trying to find a bug. Turns out I'd forgotten a slash in a path to one of the data files.
Just did this last week. Had a case for special handling db column "A" and wrote combined logic for "A" and "B" and spent an embarrassing amount of time wondering why "B" was still coming out wrong.
Or in the case of some languages:
"Oh. I forgot a return statement."
The kind bullshit that makes me extract a value from a cache I just calculated just to make sure it is working.