Ok, so if you haven't had a chance to look at
snopes, you should totally check it out. In brief, snopes researches rumors, old wives tales, and incredible photos to determine if there is any truth behind the claim.
For example, the following photos are all real:

Click
here to read about the lions and
here to read about the moose.

This is a great white shark tailing a kayaker.

While this photo appears to be of a surfer that narrowly avoided a close encounter with a shark, it is actually a dolphin and was taken here in SoCal.

This one is real. Isn't that a surprising interruption to a nice game of golf!

This one is hard to see but it's a snake in Australia trying to haul a dead wallaby out of the water.

The following photos have been exposed as fakes:

