Three incredible things happened recently -- 1) a soldier approached UFC legend Chuck Liddell and actually ASKED Chuck to kick him in the chest ... 2) Chuck actually did it ... 3) It was caught on tape.

We're not sure what the kick registered on the Richter scale (probably around a 6.0) but you'll still feel it after watching this video. It's devastating.

It's unclear when or where the video was recorded, but Chuck just posted it online along with the caption, "A soldier asked me to kick him wearing his iotv kit so I obliged."

FYI, IOTV stands for Improved Outer Tactical Vest -- but after this experiment, they might want to make even more improvements.