The magician hands out a completely normal looking block of wood for thorough examination. Once the spectators are satisfied, he leans the block against a bottle, stands back, and "focuses his psychic concentration." Within about thirty seconds, the block impossibly falls over...away from the bottle!

Again, the audience may thoroughly examine everything, there's nothing to find! Completely contrary to the laws of nature, Telekinetic Timber is a powerful demonstration of mind over matter. 

No magnets or threads, entirely self-contained, works by itself.