Monty Python's usage of cliff hanging endings in the films

Other than joking with the audience or having lack of creativity, are there any other reasons as to why the creators of Monty Python usually end their films with cliff hangers? For those who don't remember what they are, here is what I mean:

1.In "The Holy Grail", the film ends with a blatent TV freeze ending just as King Arthur and his knights of the round table were close to obtaining the holy grail.

2. In "Life of Brian", the film ends with an extreme long shot of Brian and all the other men who were crucified singing "Always look on the Bright Side of Life."