Bucks' Parker hits head on rim while dunking

That's gotta hurt.

Milwaukee Bucks forward Jabari Parker soared for a two-handed slam against the Dallas Mavericks on Saturday night, and bumped his head on the rim in his follow-through.

As a result, the 21-year-old had to ice his noggin while on the bench.

Earlier in the preseason affair, Parker spun around defender Wesley Matthews and up for another big dunk.

That one was prettier and probably less painful.

For good measure, the 2014 second overall pick also cleaned up Greg Monroe's miss, throwing down this putback dunk:

He finished with 21 points on 9-of-14 shooting to go along with six rebounds in Milwaukee's 88-74 victory.

It's Jabari's world, we're just living in it.