Most bad movies I've seen have some qualities that make them worth watching once. The following is a list of movies I've seen that aren't even worth watching one time.

Police Academy: Mission to Moscow (1994)
Batman and Robin (1997)
Mortal Kombat: Annihilation (1997)
Stigmata (1999)
X-Men (2000)
Jason X (2001)
Star Wars: Episode II - Attack of the Clones (2002)
Charlie's Angels: Full Throttle (2003)
Son of the Mask (2005)
Terminator Genisys (2015)