Well then, shoot him in the head and see if he comes back to life.
Why stop there? If he gets back up, you've your Simon/Trevor/Juste/Justin/etc Belmont work cut out for you.
Stake him through the heart if he gets up the first time, and also fill his mouth with holy water and holy wafers and bury his remains on holy ground (leave the oak stake in.) If he gets up the second time... well, you're fucked. More or less. Or you're living through the Castlevania series, and he'll keep getting up every 100 years to torment your descendants until they stake his ass too.
And now for freakiness galore, coincidentally, a priest I knew as a child was dug up in a place in eastern europe, after quite a bit of time in a casket with a full chance of the worms munching on his remains, instead, not a piece of him has decayed a single bit (if you are religious, and not an eastern european vampire/monster hunter, this is the part where you break out the garlic, laurels and prayer beads, and shiver uncontrollably with fear, btw.) Coincidentally in transilvania (Transylvania to you Americans and English only people, and Castlevania to you Nintendo freaks of old) they dig up dudes, at the 7 year mark to see if they became "strigoi morti" (different spelling, but the forum doesn't have the right character set, far as I can tell) Means "dead ghoul" or "vampire" or "zombie" or whatever you want to call it. (Coincidentally, "strigoi" without the dead suffix means "warlock" or "evil one.") Quite literally they dig the dude up, see if he's decayed and been munched on by worms, and if not, they either exorcise them or stake them through the heart, take your pick.
And you thought that stuff was just videogame and dungeons and dragons stuff, eh? I keep telling folks, "there is always a kernel of truth behind most folklore, except that one myth about voting freedom. That one's just plain fake."
Then again, until more "research" is done into this phenomenon, I'll just
or just sit my butt down and fatten up while
