I think the "everyone in my background is dead" probably tops my list. My parents died, my village was wiped out, the monastery I grew up in was destroyed, my entire clan was killed in battle, etc etc. Now they want Vengeance!
Nobody gets into adventuring because their marks in Arcana were good and they didn't know what else to do besides go to Wizard school and now they're having trouble finding a job because Abjuration isn't the growth industry they were led to believe it was.
Nobody gets into adventuring because their marks in Arcana were good and they didn't know what else to do besides go to Wizard school and now they're having trouble finding a job because Abjuration isn't the growth industry they were led to believe it was.