Atlanta Hawks star John Collins just went ahead and ended Cleveland Cavaliers center Jarret Allen's professional career with an embarrassing poster. The 24-year-old put out an exclamation point to end all exclamation points with one of the most massive alley-oops slams in preseason history.

Okay, there's a lot of exaggeration there but Collins' powerful slam was far from being exaggerated. Watch the epic slam here:

Just wow.

Sharife Cooper, the Hawks' rookie guard from Auburn, was responsible for setting up the impressive alley-oop. Cooper actually threw it higher than most of us expected so Collins had to climb way, way up to grab the lob mid-air and throw it down with authority. You got to feel for Jarrett Allen on that one. Allen had to exit the crime scene right away after being on the wrong end of that poster.

As we may all know, Collins is one of the most vicious in-game dunkers in the NBA right now. In last season's playoffs, Collins had another impressive poster on then MVP-candidate Joel Embiid when the Hawks were facing the Philadelphia 76ers in the Conference Semis and even made sure to troll Embiid with a unique shirt design a few days after.

The moral of the story is – if you see John Colling coming at you with a full head of steam, it might be wise to just move away and save yourself from potential embarrassment.