Swap

Swap is an option in Completing the Mission during the "Triple Threat" pathway.

When chosen, Henry & Ellie clap both hands with each other and swap sides and options. If chosen six times in a row, Charles comments that what they're doing looks amusing, but they're running out of time. It then just shows the choices again and gives you the achievement "This is fun!".

Trivia

 * This choice is a reference to when you change your character in the game "Donkey Kong Country".
 * This is also shown as you could hear a monkey hooting noise which sounds almost similar to sounds in the game that play whenever you swap.
 * Load Save/Save State and Barnyard Blitz and Swap are the only options in the entire series that are not counted as unique fails, nor move the story forward.