No, not Slipknot, but their carbon copy, Mushroomhead, that some how managed to rip off Slipknot 5 years before they formed.
Apparently the oh so original band write, produce and record all of their own material themselves with no outside help, which can really explain a lot.
If you’re interested in where Mushroomhead get the inspiration for their masks from (*cough* Slipknot *cough*), you can find out in the interview after the jump.
Source: Blabbermouth