WARNING: THIS IS TERRIFYING!!
New York Islanders defenseman Johnny Boychuk was kicked in the face with a skate Tuesday night ... and the scene was scary as hell.
Boychuck was skating by his crease in the 3rd period of the Isles' game against the Canadians in Brooklyn ... when Habs winger Artturi Lehkonen lost his balance in front of him and kicked backward.
You can see in video of the incident ... the sharp part of Lehkonen skate caught Boychuck flush in the face -- and he immediately crumpled in serious pain.