Because someone stole his thunder
Windows update message asking you to restart your computer
Merci backup.
Because someone stole his boat.
BY THE SHOWER OF GREYSKULL!!! I wrote this joke today. Feel free to steal it.
A very worn-out thuper hero. (An excerpt from Brother Time and the Turtle: More Excuses for Jokes: )
Thor.
The scientists were brainstorming.
Hold up your arm and say "Go back you didn't say 'May I'"
Because it was mugged.