Ruben stuffs pineapple just about everywhere
Here's a brief description of the contestant's attempt. Someone's probably working writing up more detail!
Ruben's approach seems to be to hide the pineapple in as many places on his body as possible, including in his underpants, strapped to his legs, under his hat, and stuffed into his ears, nose, and upper lip. Mark guesses correctly 22 times and incorrectly just 7 times, so Ruben places fourth overall.
(Written by Karl Craven)