I remember seeing a few kids back in the late 80's/early 90's that wore t-shirts that said "I beat Super Mario Bros." I think there was also a shirt for Zelda. Feel free to correct me if I am wrong but I was pretty sure that the shirt said Mario Bros 2 but it might of been Mario Bros 1.
If you had one of these do you remember where you got it from. I never saw them at say Target or K-Mart, so did you order them out of Nintendo Power?
As nerdy as I was as a kid, I even thought back then it was kind of a dorky shirt. A t-shirt with Mario on it would of been cool but to tell the world that I beat Mario Bros like it was going to give you street cred or something was kinda stupid.
"Hey man give you all your money....oh wait sorry I didnt see the shirt, please forgive me, actually could you help me with level 7?" That really happened to someone I knew....ok maybe not