WTF, Mario?

We were going to my dad's house the other day to get some of my mom's old furniture, and Mason decided to come down and stay with us for a little while. That night, Mason wanted to play the NES, so after I got it hooked up, he popped in Super Mario Bros. Apparently, it was messed up. I've never seen it do this. Even after I blew my entire right lung into the cartridge, it was still being weird.