The Disappearing Yacht illusion is performed by G.O.B. for the Y.O.M. Spring Break: Newport Beach party and TV show.
In an attempt to redeem himself to the fans of Y.O.M., G.O.B. makes his family's yacht disappear. This is G.O.B.'s most successful illusion. The yacht indeed disappears. The secret? G.O.B. blew it up and sank it. Ta-da! ("Missing Kitty")
Kitty was on the yacht but survived the explosion by holding on an evidence cooler marked "H. Maddas".