Face/Heel crowd reaction...
 

I'm trying to remember times when fans were so split on someone as they are now with Cena. The only one I can really think of is Rock's feud with Hogan, where Hogan got fair pops and then basically turned face at Mania, but that really doesn't count because he was turned, and Cena hasn't been turned.

Are there any other times when the fans were split over a wrestler's alignment? (TNA doesn't count.)

Kurt Angle eariler in the year.

Bret Hart.

Every TNA match Ever