"Vampires" joke

There were two vampires in Transylvania talking about how bored they were with the local cuisine. Another vampire told them they should take a trip to Italy. He told them that the food was fabulous and if you catch the people right after they've eaten, you can actually taste the wonderful Italian food in their blood.

The vampires head off to Italy and hide under a bridge, right down the road from an Italian restaurant. Pretty soon they hear a couple walking across the bridge. They swoop up, attack them, drain all their blood and toss the bodies over the bridge into the river. They couldn't believe how wonderful it was... they'd never tasted such delicacy. They decided to hide under the bridge and wait for more.

Soon enough, another couple came out of the restaurant and crossed the bridge. The vampires swooped up, drained all their blood and dumped the bodies into the river below. Not quite sated, they decided to wait for one more couple... dessert you know.

Along comes another couple, the vampires attack, drink all their blood and toss the bodies into the river. They then realize they don't have too many hours before daylight and decide they'd better head back to Transylvania.

As they're leaving, they hear singing. They know they were alone under the bridge and can't figure out where the singing is coming from and decide to investigate. They go back under the bridge and there in the water is an alligator... singing. And of course you know the tune....

DRAINED WOPS KEEP FALLING ON MY HEAD