Fat Kid at the Detharmonic (a.k.a. FatKlok) Metalocalypse : Season 1 Episode 10

Upon learning that they've once again earned too much money over the past year, the band tries to "donate" as much as they can to charity as a tax write-off. The guys also unwisely attempt fatherhood and play a landmark concert with the London Philharmonic Orchestra which ends with a killer laser light show.