We have covered plenty of fun Arduino projects here in the past. This Arduino controlled knife-wielding tentacle is one of the craziest ones yet. The developer used an Arduino, a littleBits Proto module, a servo motor, and a tentacle to complete this project. The Arduino controls the servo motor. BlinkWithoutDelay is the program used in this project.
The above video shows this knife-wielding tentacle in action. Turning it off doesn’t look easy though.
[H/T: Robotic Gizmos]