I think we have clear winner in the LeBron James Challenge. That winner is Grown Azz Kid (@DaKidGowie), who did a dead-on hilarious impersonation of bald azz King James acting crazy in a gym while rapping "First Day Out" by Tee Grizzly.
Honorable mention goes to the Greek Freak and his brother Thanasis for this (not so great) attempt. Giannis actually did a better Bill Cosby in this video than a LeBron.
Here's a few other participants in the challenge.
Grown Azz Kid also deserves some props for this amusing impersonation of LeBron realizing the Kardashian curse is real after Tristan Thompson's awful performance in Game 3 of the Finals.