He's got dozens of them, maybe even hundreds, some are ho-hum while others are actually pretty fucking brilliant. It's amazing - from the comments - how many people think he's serious. When he does it right he gives nothing away and he's got that backyard-American-Crazy down to a T. In others he goes that little bit too far - for my tastes at least.
Here's a few of his better ones:
https://www.youtube.com/watch?v=K43Aib5rovI The discovery of the note from his father warning him not to eat it is just beautiful!
https://www.youtube.com/watch?v=0DObg907MC8 Bigfoot in Barn surrounded by Police (read the comments!!)
And, finally, what I think is the best one so far:
https://www.youtube.com/watch?v=j9z-gFiHIl4 I have a Bigfoot Penis
Which is just sheer genius, and it works on so many levels.