Simple, screen capture something that looks stupid (traits), soldier/general been mauled by a lower unit or a dumb AI move, the list could go on forever.
You can use Rome mods and the expansions.
I'll kick things off, this is from Barbarian Invasion.
Moderators, I think this should be stickied, every forum needs a "fail" thread stickied.
Inferior builder and Architect? FAIL.