English to Spanish Art/Literary Idioms / Maxims / Sayings

I have translated this as "Porra" but I am unsure if that is going to sound OK in Lat.Am. ... any better ideas?

Once Walker and Penelope were safely back on the interstate, she had to ask. “What were you laughing at?”
He laughed again. “Stu won the pool. You would think they would learn.”
“What pool?”
“Some of the people at the compound had a pool on the date and time you would decide to come with me, and a guy named Stu Levy won.”
“You had a betting pool on when I would come?” Steam started building under Penelope’s collar.
“Yes,” Walker said cheerfully as he focused his attention on a slow moving 18 wheeler that had them pinned in the right lane. “We started it up a couple of months ago. Stu not only had today, he had been getting 20-1 that it would be between noon and one. Everyone thought he was nuts…”
“You and your merry band of New Age freaks were betting on me?”
It finally dawned on Walker that Penelope didn’t seem to be enjoying the joke as much as he was. “I never personally get involved, but it’s perfectly harmless; they do it all the time. It’s good practice, really.”
“Oh, really? So why was this Stu guy winning so funny?”
Walker’s voice got smaller and his eyes focused harder on the road. “Why would you bet with a guy that is possibly the most gifted psychic in the world?”