I consider interesting physical ball locks to be toys. CSI with the skull ball lock is pretty awesome. Also it's hard to beat Judge Dredd (with Deadworld mod) with locked balls orbiting a planet and unloaded by a magnet crane. Cool stuff.
The Magneto spinner/magnet combo in X-Men is a heck of a toy, if you consider it a toy.
The BDK crane is definitely one of the best.
But really...the ball gobbling T-Rex has to take the cake...