Harbhajan Singh slapping S Sreesanth on the field:

The incident might be remembered by many as it gathered the headlines. Harbhajan Singh and S Sreesanth were good friends and the Indian teammates but what happened between them is still unknown.
In the inaugural edition of IPL, Harbhajan was back then the player for Mumbai Indians while Sreesanth was playing for Kings XI Punjab. After the match ended, players were meeting for a customary handshake but Sreesanth received a slap from the off-spinner that left him teary-eyed.
Due to this, Harbhajan faced a ban for the remaining matches during that competition, having been found guilty.