If there is anything that can put David Luiz in a bad mood, we're yet to see it. Well, except perhaps Brazil's humiliating 7-1 defeat to Germany at the 2014 World Cup.
Right now, though, the Chelsea centre-back has every right to be in good spirits after the Blues entered the current international break as one of the Premier League's most in-form teams.
And, likely buoyed by the Stamford Bridge club's five-game win streak in the league and five straight clean sheets, Luiz was at his playful best during a recent Chelsea training session. Unfortunately for one Chelsea TV presenter, that meant being the victim of the defender's latest prank.
While many of his Chelsea teammates are away on international duty, Luiz remained back in west London this week having missed out on selection for Brazil's World Cup qualifiers against Argentina and Peru.
Given how well the deadline day signing has been playing since the Blues switched to a 3-5-2 formation, he could have been forgiven for feeling a little hard done by.
But, as ever with Luiz, he appeared in good spirits when he was making his way out for a Chelsea training session this week.
Spotting one unsuspecting Chelsea TV presenter filming a piece about the team's October Player of the Month competition, the 29-year-old just couldn't resist causing havoc.
The poor bloke didn't see that rugby tackle coming!
To be fair to him, he does incredibly well to maintain composure and effortlessly carry on with the segment but, given the sound you can hear when Luiz wraps his arms around him, we wouldn't be surprised if he was more than a little winded.
As for Luiz's technique? With Brazil coming in in 28th place in the World Rugby Rankings, the Chelsea centre-back might want to put himself forward for a game in the near future.
Getting to hang out and interview world-class footballers on a daily basis makes being a Chelsea TV presenter sound like a very appealing job.
However, after watching the above video - and another from earlier in the season, seen below - you definitely have to have eyes in the back of your head.