After I made a snarky comment about how I thought the following image was one of the 5 least likely to be posted here on PSA, I was challenged to name the other 4.

 
Well TheMelkman, Jscape, and the others, here you go.

Number 5:

I already made the comment I have to put it on the list.

Number  4:

THAT THING IS UGLY AND I HATE IT!

Number 3:

If you can come up with a reason why that picture would show up in conversation then go ahead, otherwise no explanation needed.

Number 2

I'm not entirely sure who that guy is, or why his head has been photoshoped onto the head of an Alpaca, but I do know that if you actively seeked that photo out to put into a conversation here on PSA, you are a nutjob.  Which apparently makes me a nutjob.  Guilty as charged.

Number 1

DRUMROLL

There is a tie for Number 1.  I don't have the heart to post either of them.  I think you can all guess what they are.  So instead here's a picture of Cervelli!