my favorites when "oh I don't feel guilt," or "oh I don't regret anything" ala Punisher, Thanos, or Captain Marvel, which is really hilarious when you stop to think about it because if that were actually the case it'd be an absolute horrible move to use on actual comic villains who generally don't actually feel remorse or guilt over their actions. Honestly the Penance Stair is up there on the "most misused ability in comics" list if not right at the top