> Counterexamples welcome.

I mentioned "peas and honey" in another comment. zucchini and lube if you wanted to go for "haha weird sex practices", though just having condoms/lube in there doesn't make things intrinsically funny the way the OP seems to imagine. baby food and wine/headache pills/earplugs, for more sitcom-level humour ("haha, yeah, having a newborn is hard, we've all been there!"). knife and large garbage bags for a darker turn

the basic idea is "these two specific items suggest a funny image of them being used together, with the added context that it was likely just a random coincidence". it's not laugh-out-loud humour, but it can be amusing.