Most unnatural weight classes a fighter...

Well fighting 10% under your natrual fighting weight is certainly not going to extend your career.

 

no doudt toney!!!!!

 

not 100% under the rules, but Jeff Fenech was a former bantamweight, retired from the ring and bulked up to somewhere near the heavyweight limit(or not far off it) to play rugby league, and then went back to junior lightweight? for his comeback.

 

Pazienza.

Qawi.

 

Iran Barkley at heavy

 

I remember reading the "box scores" in the boxing magazines back in the day and seeing Lupe Pintor' name at junior welter. :-( Can't imagine what he must have looked like.

 

Roberto Duran at middleweight. For the world lightweight champion to whip so many top middleweights, even winning the title, and putting on a real show against the best ever middleweight - well, that's just amazing!