Crosses over your left shoulders, and if you keep your backs hard up against the cross beam, you'll be there in no time.
7 seconds sound clip from the Life of Brian movie soundboard.
You can hear this line at 01:19:39.503 in the Blu-ray version of the movie.
Quote context
[...]
- Silence! This man commands a cwack legion! He wanks as high as any in Wome.
- Crucifixion party! Wait for it! Crucifixion party, by the left, forward!
- You lucky bastards! You lucky, jammy bastards!
- Let me shoulder your burden, brother.
- Hey, what do you think you're doing?
[...]