Func climbable pole
Func_climbable_pole is a brush entity in hunt down the freeman. It is used with the game's parkour mechanic. When player jumps on this "pole" without weapons. Player is available to climb it up or slide it down.
Taking hold of the pole without jumping into it first, makes player unable to move. Prone to get unstuck.
Bhis brush entity can corrupt .wmf files so make sure you have auto save enabled just in case