Do mushrooms go off?

[calibrax]

I have a pack of chestnut mushrooms in the fridge which are about a week past their sell by date... will they still be ok to cook & eat? or should I bin them because they will poison me?

[calibrax]

Thanks for all the replies. The mushrooms seemed ok, so I had them. But if I find myself in A&E in the early hours, when I get out I'll come looking for you all...!

[calibrax]

Dogwatch said:

If they really were mushrooms I doubt if you'll be troubling A&E.

True. But I could still end up like this...

http://www.youtube.com/watch?v=b7l6jg4Hlog