Angry German Kid, Keyboard Crasher, Unreal Tournament Kid, PC Spielen or Leopold Slikk are the names of a viral web video from 2005 showing German teenager Norman Kochanowski (born May 29th, 1991) trying to play Unreal Tournament on his PC, but he faces problems with it, such as the game loading up slowly, which causes him to get enraged and shout, as well as smashing his keyboard in some scenes. Business Wire awarded Angry German Kid second place in the top 10 internet videos of the year in 2006, and in 2007, The Guardian ranked it as number three on its Viral Video Chart.

Ever since he received a camera for his 13th birthday, Kochanowski had been experimenting with it and releasing short films under a variety of aliases, the most popular being "Leopold Slikk". At first the videos were published in forums and video sites or exchanged on CDs. In 2005, he released a parody of rap music videos with the fictional character "real gangster". It quickly spread to many platforms, and its success led to sequels featuring the same character. In addition to "real gangster", he often calls himself "Slikk" online.

In 2005, he released "Real Gangster 5: Play PC", in which he acts as a gamer who throws a tantrum because the computer game Unreal Tournament does not load fast enough. He grows angry, yells at the computer and smashes his keyboard. Even after the game loads, he still loses, ultimately destroying the keyboard in a fit of rage.

After its first release in 2005, the video was soon shared on other sites, including YouTube. The video and its protagonist became known in Germany as Unreal Tournament Kid, in English-speaking countries as Angry German Kid, in Spanish as El Niño Loco Alemán ("the crazy German boy"), and in Japanese as Keyboard Crasher (キーボードクラッシャー, Kībōdokurasshā). The video was edited by others, music was added, or other words in other languages were put into the protagonist's mouth. It soon established itself worldwide as an internet phenomenon and spawned a web series called "The Angry German Kid Show".