Historical clue formulations

• [D'oh!] — 2023-03-28
• [I'm such an idiot!] — 2021-02-27
• [I can't believe that just happened!] — 2017-02-03
• Alternative to a head slap — 2015-01-23
• Nonverbal equivalent of "You have got to be kidding me!" — 2014-01-18