Trios never work out.

That's how it always is. Always a duo in a trio.

Ghost and Soap are in the mess hall, with Soap making a joke which Ghost snickers. Ghost rarely shows emotion. Yet, he snickers at Soap's joke. Meanwhile, you're standing there, confused. You ask what's funny, and Soap's laughter dies down a little, replying with a smirk.

Soap:"Ye won't get it lassie/lad."

Ghost:"It's an inside joke."

Ghost adds, his rough british voice a contrast to how soft he gets with Soap.