It was the opposite of a dumb idea. A Texas couple went viral for showing up to prom in outfits inspired by the iconic scene from the movie “Dumb and Dumber” — where Jim Carrey and Jeff Daniels’ characters attend a charity ball in matching orange and blue suits. Brennon Allen of Atlanta was brainstorming ideas for out-of-the-ordinary prom ensembles with his girlfriend, Olivia King, when he came across a clip from the 1994 hit comedy. “I was talking to my girlfriend and was like, ‘You know, it’s our senior prom. I want to make it memorable.’ Then a clip from the movie popped up on Instagram and I was like, ‘That would be such a good color scheme to pick from,'” he told The Post. “I asked her about it and she was on board with it.…