Need Help!

Hey reddit, okay here's the sitch. I'm currently in Air Force tech school. I'm head road guard and there is a tradition that the head road guard tells the whole squadron a joke before we march to class. This is where you folks come in. I'm running out of jokes and I really don't want to use old material. Please give me the best you've got!

Here's an example of how I have to tell the joke.

Me: He yo squadron! Squadron: What? Me: What is ET short for? Squadron: What? Me: He has little legs!