Armless guy: Even though I don’t have arms, I can do anything you normal people can do.
Me: 🎵If you’re happy and you know it, clap your hands! 🎶
Armless guy: Even though I don’t have arms, I can do anything you normal people can do.
Me: 🎵If you’re happy and you know it, clap your hands! 🎶
Listen up, buttercup. The joke is that the armless guy brags about being able to do anything normal people can do, and then the other person sings "If you're happy and you know it, clap your hands!" which the armless dude obviously can't do. It's funny because you're dense.