There's also some good answers on my Pinterest pin of this photo.

This picture dates back to at least 2008:

I'm guessing photoshop but I still have not found a good origin story for this photo.

We may never know. :(

The earliest photo of him that I can find in Google Image Search is December 2007 on Flickr:

It's possible he originated on LiveJournal:

Doesn't look like PS to me guys... (I moonlight as a photog :) ) .. but I could be wrong..

Maybe the cat looks angry because it's actually in that lake?

maybe he's angry because someone put his giant watermelon in the lake ?

Good point, Louise. I'd be angry if someone put my watermelon in the lake, too.

Angry birds, watermelon edition!

had I been drinking tea Adam, you would have made me spit it out :)

Angry Watermelons?

haha The Angry Birds watermelon boat is awesome!

I asked my artist friend about that photo. She said it isn't photoshopped... The mystery continues!

Aha! Another clue!!

made my day!

Oh, so that's why they call it a WATER melon. :)

He's the ultimate fruit ninja!!

Dies ist MEINE wassermelone!!!