doomwiki.org

ned5o TIL that in a 1993 press release, id Software had written that they expected Doom to be "the number one cause of decreased productivity in businesses around the world". Doom indeed became a problem in workplaces like Microsoft and Intel, and educational institutes like University of Louisville.
6ERgZ TIL Doomguy, the protagonist of the game 'Doom', has a pet rabbit named Daisy, who appears in both the original games and the rebooted series.