This conversation really happened. I've tried to present what the other people said accurately, but it was smoky up in that joint and I may not have been paying total attention:
person one: You know, that movie version of Lonesome Dove really got period details right. For example, there's that part where Gus gets out that buffalo gun, and he used a special configuration of the sight to get a few hundred extra yards out of the shot.
person two: Yeah, the cool thing about that is the trajectory of any projectile follows a parabolic arc, and so if the earth's gravity were concentrated in a single point, the bullet would travel around that point and back again in an elliptical orbit.
Me: So, like, you could shoot yourself in the back?