It depends on the knowledge I have about the actual age of said thing. or maybe what has happened to it in its edible life. when you go to a restaurant, the food you get looks good and smells good and even tastes good. However, things have happened to it that you wouldn't do to it if you were cooking it for yourself.. so yes, I would.
No. I am really anal about throwing out anything that is at all doubtful. Even if it has only been a couple of days, leftovers go in the bin. I had food poisoning years ago and ever since then I do not take any chances. Not worth it.
That is really not kind as I have never put that in the fridge. Left over maybe, but never refrigerated!!