Family Guy: The Lost Episode, Peter and the Holy Grail

You are Peter a fat man. You are often offensive and say everything stupid that you can at the worst times. But you don't even know! Brian your dog has told you if you find the Holy Grail and drink from the sacred glass you will gain godly knowledge. Hey, I can sell it on e-bay for lots of money! You think to yourself. A quest has begun. What do you do?