A case where two identical CGI zombies are placed next to each other in a shot. Occurs when an animator is running out of render space, is lazy, or gets off on copy/pasting. As seen in Season 1, Episode 2 of AMC's "The Walking Dead".
Son: "Dad, did you see those two CGI zombies next to each other? They were twimbies!"
Dad: "Son, stop watching that and Tivo my Glenn Beck already."