Remembering the warm squishiness of a fresh dog turd squeezing up between your toes in the park. Or remembering waking up beside something that Definitely did not look like that the night before.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)

Bad memories. Any incident you remember and wished never happened.