Weezer will be performing rock music in this coming Monday's (5/2) new episode of The Hard Times Of RJ Berger, playing at 10PM ET/PT on MTV. How and why did this happen you may ask? Well, as it turns out, the show's two creators are such big weezer fans they named the high school in the show Pinkerton High. Later, Rivers met them and said "Since you guys are such fans, maybe we should come on the…