My ass is on Vacation

Today I saw a t-shirt with a guy camping in the woods and doing pretty much nothing, the text below the image said: "My ass is on Vacation". So, I look for it online but I couldn't find it, but I was able to find this one:

What do you think? Is it funny? In case you want to buy it you can do it here. By the way... my ass is on vacation until next Tuesday, talk to you then.

Update: I found the web page of the original Attitude Jack (the mule/donkey in the picture), pretty funny!

Relaxing.