That's a though question! See, back in my day, wingfic was definitely a crack trope, but now it's just, you know, wingfic.

I tend to like crack-taken-seriously best out of all the kinds of crackfics there are -- but unfortunately those don't tend to stick in my mind as 'crackfic'.

Also, I can't tell if it's supposed to be my favourite crackfic I wrote or that someone else wrote. A favourite that I wrote is Twelve Days of Mad Science, because I specifically wrote it with the goal of sticking as many crack tropes in there as I could. It's mad comic-book science, I am allowed.