[MattPalmer1086]

It's a very obvious joke, but can only be understood if you read both tweets, the original and the reply.

Person 1: 15 year old me would have cut a leg off for access to youtube. Person 2: there's probably a video on how to cut your leg off!

Person 2 gets banned, Person 1 was the first to mention cutting his leg off.

I can't see how this isnt an obvious joke, no matter what language you speak.