Even when they are attempting to be dead serious.
I ran across a vintage cover of an Agatha Christie book I just had to share because, besides being an old one ($.25?) I hadn’t seen, she’s being strangled by… the Hulk??? Which stopped me dead in my tracks. 
I mean her skin tone is pretty normal even if she does have a slightly green tint so this isn’t an aging thing going on. The hands strangling her are very green though.