If it's going to be eight words, then I'll post my favourite 6-worder here (not mine but can't remember who did write it - though Orson Welles is the name in my head): For sale: baby shoes, never worn.
Tarol Hunt (of goblinscomic.com) has been writing nonsense Twitters, usually of the form 'If I ...' Some of these are worthy of Jack Handy himself: "If I was stung by a bee, it'd better not be a laser bee because those guys are puuuuuure laser." Can we have a go? "If I was a caveman, I probably wouldn't ever say 'Yabba Dabba Doo' unless I was being deeply ironic."