@Stoppedat1 - cancel the cheque came after a CF thread.
A woman was invited to a wedding of an old colleague. Accepted, went, and as they'd said they wanted money, she provided a cheque for, I think, fifty quid? Not a derisory amount, for someone you aren't close to, anyway.
In the week or so after the wedding, she had an email from the groom I think it was (?) sorrowfully saying that they had expected her to be less stingy and they were inviting her to reconsider her amount, or words to that effect. I think she'd recently inherited some money, and she thought they knew that and it was probably, in retrospect, why they'd asked her? Anyway, posters suggested she cancelled the cheque. She explained that it was too late, and had already cashed. And then for page after page after page (it hit 1000 posts, pretty sure?) people just posted again and again earnestly advising her to CANCEL THE CHEQUE! So it's become shorthand for RTFT.
I want a stop the cheque emoticon. I'm sure people would notice a splattering of a cheque emoticons sometimes, even when too lazy to read previous posts. And it would relieve frustration to be able to post it!