The one where civil war breaks out between the Monoids...
The Bomb really is very silly. It's jam-packed full of silly moments, silly dialogue and silly situations which undermine what is a generally solid story. Talking Monoids just do not work for me, they come across as supremely ridiculous. Take, for instance, the early scene where the Monoids consider the fate of Two. They all stand around waiting for their leader, One, to decide what their next move should be. They watch him pace up and down, thinking hard and posturing accordingly, until he announces his plan. Then we see two Monoids conspiring against One's leadership, but who are overheard by One's loyal deputy Three. One is not bothered by mutiny in the ranks however, and chuckles to himself about the futility of rebellion, reminding Three (and the viewer) of the explosive placed in the statue's head.
Referring to Monoids as One, Three, Four and Seventy-Seven is all so very silly (and confusing). There's one line where Three says to One: "There is still no contact from Two on Refusis, One", which wisely omits the planet's full name of Refusis II.