This is a shocking effect. The audience walks by a gorilla cage with bars on the front to confine the 'animal'. As they get closer, with super strength, the gorilla 'bends' the two middle bars and reaches out at the audience.

The trick to this effect is that the two middle bars are made of inner tubes and the rest of the bars are conduit painted black. In the dark it is very difficult to tell that the two middle tubes are different than the others.