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'Bloodborne' pathogens! Watch USADA surprise Demetrious Johnson during live Twitch feed (Video)

Ultimate Fighting Championship (UFC) flyweight champion Demetrious Johnson was streaming live for all his fans, then he was forced to stream live for United States Anti-Doping Agency (USADA), who showed up unannounced to collect blood and urine for a random, out-of-competition drug test.

Fortunately, that part did not air via his "Bloodborne" Twitch feed.

"One second, someone is knocking on my goddamn door like they're the police," Johnson said. "[Who] the fuck is knocking on my door like that?"

Whoop! Whoop! That's the sound of the police guy with a Styrofoam cup!

Johnson (23-2-1), who is currently without equal in the promotion's 125-pound division, is expected to face his stiffest test to date when he collides with top contender and former Olympian Henry Cejudo at an upcoming UFC event later this year.