If you go to the part where Joe meets the Indian friend and trips over the metal thing in the ground, in his dream, after the Indian guy disintegrates, when the shot goes back to Joe...check out his shirt, the words are backwards...weird.
The reason for the backwards text is because of a little-known fact that in dreams, any words or text that you see are backwards. You can test this by dreaming of reading something.
It's an "I choked Linda Lovelace" t-shirt, he has a respactable mullet, he tripped over a septic tank that he thought was an atom bomb while offering therapy and business consulting to the native american owner of a failing roadside fireworks stand and they used stock footage of an actual nuclear bomb explosion. That's the definition of funny. Now who cares if his shirt's written backwards?