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Re:Why I Quit Being So Accommodating (1922) by JacobAldridge on Thursday May 25, 2017 @09:54PM (#14421558)
My current go-to is "I'd love to, but I can't because I'm folding t-shirts at that time". Humorous rejection for those who get it, passes the photocopier 'because' test which actually suffices for many, and achieves your confusion/escape route for most of the rest!
Re:Why I Quit Being So Accommodating (1922) by tripzilch on Saturday May 27, 2017 @03:38PM (#14431601)
"I have to wax my cat"

I have no idea where I got that line from, but it's stuck because of it's absurdist hilarity.

I don't say this as a serious reply of course. It's intended to communicate that the nature of the request is such that I feel I shouldn't even have to decline it. In practice usually it just generates friendly confusion, which benefits all parties.

disclaimer: I don't have a cat. Nor would I wax one if I did.