During a conversation, if one manages to perform the following in sequential order; a one-upper, a random segue, a one-downer, and finally another random segue which takes the conversation back to the beginning. The sequence can begin at any step as long as it forms a figurative box at the close of the manoeuvre.
"Terry is boxing the conversation with Bennie, this is hilarious! Hahaha!"
or "You've been boxed bro!"
or "Classic boxing!"