While waiting in line to have his blood test at work, Homer prays for good results and then begins to "...mumble in a religious fashion. Dear God. Oh Lord. ...Oh Lord Almighty." and when he reaches "...abba-dabba-dabba-dabba" nonsense, you can hear someone in the recording booth let out a wheezing laugh. This may have been ad-lib material from the actor, Dan Castellaneta, not originally intended for the final cut.
Actor Brent Spiner, who guest stars as the voices of all the robot workers, is most famous for playing the android Data in Star Trek - The Next Generation (1987). This could be a nod as to why he was chosen for the role