I played against a guy who insisted that bubbling mucks double all black mana symbols, because all black mana symbols were swamps...
I remember:
Him: Swamp, rituals, muck, rituals, rituals, corrupt, take 14.
Me: Um, no.
Him: what do you mean?
Me: I take 1.
Him: No, I have 14 swamps.
Me: No, you have 1. 14 total mana. 1 swamp.
Him: You're cheating.
Me: Um, no. Look, let's ask that guy....
(ten seconds later)
Him: Leave me the hell alone.
Me: (Shrugs) Okay.
Him: They ARE swamps!
Me: That's not what he said.
Him: Screw you.
***End of conversation***