Sure, here's a potential plot for a new Curb Your Enthusiasm episode:
Title: The Gym Buddy
Larry starts going to a new gym and strikes up a friendship with a fellow gym-goer named Mike. They bond over their shared love of basketball and Larry is excited to finally have a gym buddy.
However, Larry quickly realizes that Mike is a talker - he's constantly chatty and always trying to strike up conversations with Larry mid-workout. Larry finds this distracting and annoying, but can't bring himself to tell Mike to tone it down.
To make matters worse, Larry's assistant tells him that Mike is actually a known con artist who's been preying on lonely gym-goers to steal their personal information. Now, Larry is unsure how to proceed: he doesn't want to hang out with a con artist but he also doesn't want to be rude to his new gym buddy.
Things come to a head when Mike invites Larry to a basketball tournament that he's organizing, promising him the chance to play against some former NBA stars. Larry is skeptical but agrees to go, only to find out that the tournament is actually a scam to bilk players out of money.
In the end, Larry realizes that he needs to stand up for himself and tells Mike that he can't be his gym buddy anymore. Mike is hurt, but Larry feels relieved to finally be free of him. As a final twist, Larry runs into one of the NBA stars from the fake tournament at a coffee shop and ends up bonding with him over their shared frustration with Mike.