
Retired boxer Vitali Klitschko is the leader of the Ukrainian Democratic Alliance for Reform, a group oppositional to Ukrainian president Viktor Yanukovych. During a protest he was trying to keep the peace when one person in the crowd very unwisely sprayed Klitschko in the face.
Usually upsetting someone with professional fighting experience is a bad idea. Especially when said person is a huge man. Still, Klitschko was held back and kept away but he was clearly upset, as he should be. Afterwards he was covered in a white residue.

Hat tip to:
Or a still shot:
Photo of Ukraine opposition leader Vitali @Klitschko after he was reportedly sprayed with a fire extinguisher: http://t.co/Oodl61BOhc
— Mark MacKinnon (@markmackinnon) January 19, 2014
Or a video:
Or this video of Klitschko in the crowd:
