3 unique mechanisms that I found interesting.

Timestamps:
0:00-0:40 Reciprocation through opposite gears
0:41-1:38 Grab and lift arm
1:39-2:22 Reciprocation Mechanism
2:23-2:39 End

NOTE: Not all these mechanisms are originally designed by me! I do not take credit for the designs, however I modify them as I fool around with them, eventually sharing them in this video. Full credit goes to the following:

Reciprocation through opposite gears:    • LEGO Sketchbook 2013   at 0:50

Grab and lift arm:    • Amazing LEGO Side Loading Garbage Tru...  

Reciprocation Mechanism:    • Reciprocating motion machine made fro...