My camera is stuck to a tripod. It seems to be screwed in there extremely tight. Advice?

Can't unscrew bu any conventional means. Strongest people I know can't do anything about it. WD-40 has been of no help. Trued using a wrench, pliers, etc. It's screwed into the bottom of my camera like nothing I've ever seen. No idea how this happened. Need camera for work. Help, please?