A cadenza

A YouTube commenter remarks that this style of cadenza, where the performer is quoting contemporary material, pulling bizarre stunts, and doing their damnedest to impress and entertain the audience, is actually more spiritually authentic to Mozart's era than playing anything "Classical" would be. I've no idea if that's true, but it sounds good. The main remark I can think about cadenzas, made by M, is that everyone is dogmatic, but no one agrees. So really, you can do whatever you want.