First a little backstory.
As I'm sure many of you already know, the song is the title track to the 1983 film, Monty Python's The Meaning of Life. This remake was recorded with the lyrics sung by Professor Stephen Hawking as part of the 2014's Monty Python live reunion shows.
The guy who gets mowed down in the video is renowned physicist Brian Cox, who was in the middle of explaining how the song isn't exactly scientifically sound when Hawking takes him out.
If the song is your sort of thing (and it should be), you should try playing Monty Python Asteroids while listening to it right here. You can also check out the history of the remake and see Hawking's fantastic reaction to hearing the remake for the first time, right here.