In the deleted scene, Johnny Knoxville introduces the item which Luke Wilson will later fall victim to: a 1945 military field phone. He then goes on to explain how soldiers apparently would use the field phones as a torture device before demonstrating how the phone can shock people. The group, which includes the likes of Loomis Fall and Steve-O, go around testing the gadget on themselves. This, of course, results in many shocking reactions, as the group is zapped one by one.
Towards the end of the scene, we realize that Wilson is on set when he's called over to participate. You can just see on his face that he is hesitant about whatever is about to happen to him. Steve-O then attaches cables to the webs of Wilson's fingers and, you guessed it, Wilson is shocked by the phone, which causes him to jump up in pain.
In the end, Wilson takes it like a champ and adds even more comedic effect to the scene by saying, "I actually feel energized after that." The scene then ends, only being just over two minutes long. It is a fun and simple little stunt, but since it was so short, one could see why maybe it didn't make the final cut.