Half-Life 2 Easter Egg - Celebrity Reference

In the "Black Mesa East" segment, just after Judith unlocks the door for you (just before the elevator) when you look down the tunnel through the chain link fence you will see a citizen walking away from you. Flip on noclip and pass through the fence to follow him. Once he gets down to the "T" at the end of the tunnel he begins pacing back and forth. If you look closely this character bears a striking resemblance to David Blaine, the magician. To further support this, at both ends of his path he stops and hovers several inches off the ground momentarily. At first this looks like a bug but when combined with the fact that one of Blaine's more infamous "Street Magic" illusions involves hovering a few inches off the ground this is definitely an intentional egg.