One night, before a Kiss gig, snuck up behind Peter Criss and knocked him out, hid Peter in his bed, put on his outfit and makeup, and anonymously joined Kiss behind the kit for the show. After the show, he just skulked away. That show has gone down in Kiss Army lore as Peter Criss' best ever drum performance, whether live or in the studio. The following day, the band found Peter in his bed and congratulated him on his performance of a lifetime. Peter didn't remember it, but didn't figure anything was wrong since he blacks out on drugs and alcohol all the time.
Is quite happy living with this accomplishment of his, and is satisfied no one in the world will ever know the truth.