In the scene where Nazi soldiers are chasing Indiana Jones. The one when he is riding a motorcycle (the one with the side car). At one point he and a Nazi soldier, who is heading straight for him on a similar bike, in a "chicken" (the dare you to move away first game) kind of way. He reaches out and grabs a flagpole on the side of the road and it breaks (you see it break and it is made of wood, I think it even makes a sound) and uses it so it looks like when knights are challenging each other with those long lances (can’t remember the name of the game) and of course he stabs the soldier and wins the duel.

OK correct me if I'm wrong but, anyone riding a motorcycle at high speed and reaching for a flagpole would break their arm or it would send them flying of the motorcycle.