Helmet memes

Why couldn't the astronaut put the helmet on his head?

Because he didn't have enough space.

Jim and Allyn are 2 mates in the Air Force. They were paired up for a training exercise. They got up into the air and Jim said, "Okay Allyn, your helmet can control the missile when launched from the jet. Go ahead and test fire a missile and aim it at anything you want." Allyn fired the missile and had his eyes set on an abandoned building. Jim then said, "I also forgot, watch out for friendly fire." Allyn said "What?" as he looked over at Jim.

What do Evil Knievel and Michael Jackson have in common? Both have skidmarks on their helmets.