WARNING: Video contains graphic language

Charlie Zelenoff has racked up a lot of views on YouTube with his boxing challenges.

Zelenoff has been known to go to fitness gyms and ask people who are there just getting a workout if they can help him with some light sparring. However, when the “light sparring” session begins, it’s obvious Zelenoff goes all in for a knockout.

Here, we see Zelenoff call out WBC heavyweight champion Deontay Wilder out by leaving a voicemail. Wilder accepted the Zelenoff’s challenge and met in a gym in California where Wilder punished Zelenoff for his bullying and trash talk.

Zelenoff also states in the video that he knocked out Floyd Mayweather Sr. right before Wilder chases him out the door.

This article first appeared on BJPenn.com on 6/19/2017.