Remember that scene in “Crocodile Dundee” where the mugger pulls a knife, and Crocodile Dundee says, “That’s not a knife, THAT’S a knife”? It’s almost three decades later, and we finally have the real-life version. Two guys went into a convenience store in Pittsburgh over the weekend pulled out a 12-inch MACHETE, and tried to rob the place. But the store owner wasn’t intimidated . . . because he happened to have a much BIGGER sword behind the counter. He pulled it out . . . the two guys knew they were in TROUBLE . . . and he chased them out. The cops are still looking for them.