Popular culture sidenote : in France, the Bogdanov's brothers are now the standard butt of jokes related to:

- aesthetic surgery (in a close race with actresses Emanuelle Beart and Angelina Jolie)

- aliens (or people looking like, claiming to have met, or communicate with aliens)

- chins (a rather popular comedian has based about 12% of all his jokes about silly puns with Bogdanov's brothers and the word 'menton')

- lots of other stufff

- mad scientists

- and, I suppose, cosmologists (although it is probably a challenge to make a cosmologist joke in front of a regular audience.)

For whatever it's worth, next time you have to make a standup routine in France.