YouTube trends don't get much bigger than "Spider-dog". Within just over a week, about 80 million people watched a dog in a spider costume scaring passers-by.
But the Polish YouTuber who made it is still relatively unknown. #BBCtrending caught up with him in Warsaw, where he told us about his mission to change Polish culture, his obsession with taunting the Polish police and just how far he will go for an adrenaline rush.
Produced by: Greg Brosnan, Anna Meisel