OMG the lock mechanism on the Lego NES! The way it catches and releases!!!! When it came together and I realized what I'd just built was one of the most magical moments
7 Simple Mechanisms to add movement to your LEGO creations - YouTube
Lego Technic Mechanical Adjustable Seat | MOCHUB
LEGO MOC Periodically Reversing Mechanism #3 by 2in1 | Rebrickable - Build with LEGO