Some pretty awesome LEGO machines. As ever, +1 geek experience point awarded to all the creators and programmers here.
LEGO basket ball machine.
LEGO Bowling alley
Lego claw machine
Small mechanical LEGO loom
Too cool not to include here - LEGO arcade games! I want to make a stop frame animation like this!
If you liked these videos then you might like these older LEGO posts:
Really Cool LEGO Robots
Awesome Marble Runs Built in LEGO
A feast of LEGO train sets