But when they tried playing the Best Friends Challenge (in which players attempt to guess each other’s answers to questions), it proved a little more difficult than either star may have imagined.

Jimmy asks Steve Martin and Martin Short random questions pulled from the best friends box and has them take turns guessing each other’s answers.

Fallon had a new game in store for the married couple, dubbed the Best Friends Challenge ... revealing that Timberlake would ask a question about himself, and both Fallon and Biel would write ...

The questions had been generated for a study by researchers including Arthur Aron, ... but after spending the week together working through this challenge, I feel like we’re best friends now?

In a game called “Best Friends Challenge,” host Jimmy Fallon explained that the rules are similar to “the Newlywed Game but for friends.” After Fallon asked questions about Martin and ...