Fun thing to do (Only if your computer can handle it, lol):
Spawn a Rollermine from the NPC menu. Then get the physgun, pick it up and freeze it in mid-air. Spawn the manhack gun and click all over the rollermine. If you can try and unfreeze the rollermine, or use the button to unfreeze all.
Bam. Flying rollermine that cuts you up and makes a stuffload of sparks emitters, thus why you should only do it if your computer can handle it.