I think Pizza is always safe.....Even when the cheese becomes that matted, greasy mess....You can still eat pizza....Even cold if you're that stoned or lazy.
Subway keeps well....The veggies become a bit wilted, but still edible....Incidentally, Quiznos does not follow this rule.....Toasted meat dries out too badly.....Chinese tends to keep like a motherfucker.....I've gone back for Chinese in the fridge a week later and was not disappointed.
Burgers, fabricated hotdogs, fries, pancakes, pastas with any sauce other than marinara........These shits don't keep well.......Fried chicken can still be edible, but it's nowhere near it's fresh, crispy glory........Steaks are cool too, but rarely do I have any steak left over......Fried shrimp.....Fried shrimp is terrible if not eaten upon serving.
All salads, and salad sammiches (i.e. Chicken salad, tuna, anything mayo based massively)....Just throw it out....It sucks after 2 hours......Vegi salads have too many elements that fuck it up.....Like in a subway sammich, I can toss the tomatoes and cucumbers and still eat it....But a legit salad....It's all terrible........Have you ever eaten a cold, wet crouton.....Just don't.