Willian revealed that he psyched out David Meyler just before the midfielder missed a penalty in Chelsea's victory over Hull City in the fifth round of the FA Cup.
The Brazil international scored two goals as Chelsea advanced to the quarterfinals, with Olivier Giroud claiming his first goal with his new club and Pedro also on target in the 4-0 victory.
He also had a word in Meyler's ear just before his spot kick was saved by Willy Caballero -- and revealed he told his opponent he would fail with his attempt.
"I said to him, 'You're going to miss,'" Willian told BBC after the game. "I said, 'Don't shoot in the middle because Willy won't move, he stays,' and then when he missed I said, 'I told you.'"
Willian struck the post with a late effort that denied him a first hat trick, but then immediately targeted further goals against Barcelona.
"It was almost there," he told Chelsea's website. "I tried to score one more goal but the most important thing was the win.
"I was unlucky but I hope there are more goals to come in the next match."