I wish something like this would happen to me. So many ways I could turn it into the funniest thing ever.
"Dammit, I was at peace and ready to cross over, but then I heard that eulogy, and I had to come back and say something. Seriously, do you know me at all?"
"God dammit, you people want me dead so badly I can't even take a nap without you stuffing me in a coffin? Well, sorry to disappoint you, but I'm very much alive. You people, you're too much! Please tell me there's an open bar at this thing? Also, please form an orderly line so you each get a chance to kiss my ass!"
"DAAAAMN that was some good heroin! For a minute there I thought I saw the face of God. Oh, this is my funeral... and now that I think about it, I've never done heroin. Hmm... Well... why do you all look so shocked?"
"Ladies and gentlemen, friends, family, lovers... yeah, you know who you are. Her and I totally did it everyone. I know, right? She's hot. Anyway, I have returned from the other side because my work is not complete. I stood before the throne of God, and it was Odin. Odin is the One True God! And I his prophet!"