Invented by Ian O'Connor, the Retardis (Replicated Entry-level Time And Relative Dimensions In Space) is a slower version of the TARDIS. Instead of a police booth, it is a port-o-potty.
The most famous use of the Redardis was done by Ian during his f*** up history campaign. Using the time-traveling capabilities of the Retardis, Ian went back in time to 44BC to take part in the assasination of Roman emperor Julius Ceaser.