Watch: All the maniacal ways Diego Costa celebrated Chelsea's title win
Warning: Video contains coarse language
Diego Costa is a closed book. It's impossible to understand what's going on in the head of football's chief provocateur.
In the aftermath of Chelsea's victory at West Bromwich Albion, which secured the Blues' fifth Premier League title, Costa stirred up trouble everywhere from the pitch to the dressing room to Antonio Conte's press conference. But it was just another day for the childish villain, whose psychotic tendencies are as inexplicable as they are entertaining.