opb:
clichés only have one function in my opinion, and that is to be used ironically for humorous effect,
I agree with that, and have mostly used them ironically myself, but it feels to me like most authors on here
do use them ironically. I'm not positive about this, but I think the place you are most likely to find these clichés - "you've been very naughty, little boy/girl, time for a lesson for your own good" - is in adult stories, where the spankee is neither little nor a boy/girl, and lessons for naughty people's own good are necessarily a pretend game.