The clue started off 'The audience is so stupid...', so the audience picked the reason for the shock not the show, so if they're really stoopid they're going to either pick clap or laugh. The contestant said 'clapped', while 2 or 3 of the celebs said 'laughed'.
I'm sure Colton's husband thought the same thing! I'm a fan of Linda's but it seemed she was going to maximize her time while she was on Match Game (shooting t-shirts, making out...)