Claudio Ranieri promises he will flip tables and send objects flying in the changing room if Fulham's players do not follow his instructions, just like he did at Chelsea.
In a warning to his new squad, the normally-cheery Italian insists he will only accept hard-working and passionate performances, starting on Saturday when struggling Southampton visit Craven Cottage.
Fulham sit bottom of the Premier League and Ranieri, who replaced sacked Slavisa Jokanovic over the international break, says he is ready to reveal his lesser-seen angry side.
'Don't look at me here, with the smiling. In the dressing room, I am different,' Ranieri said. 'It depends what happens. Sometimes I could take this table and flip it in the air.'
The 67-year-old, who managed Chelsea between 2000 and 2004, was asked whether he had vented frustration like that before. 'At Chelsea,' he answered. 'All the vitamins. Boom! Boom! Boom! 'F***ing hell!' Sometimes I enjoy, sometimes I am very strong.
'My players know me. My players know me very well. We have to fight. Our fans must understand that, at this moment, we have to fight.
'Our fans must be happy when they see their players fighting on the pitch, win or lose.'
Ranieri has only had two days to work with his full squad following the return of several players from international duty, so they have not yet seen his furious side.
'With them? No. With these players, no. Not yet,' Ranieri continued. 'At this moment, I must give confidence. It depends on the result.
'When I say our fans must help us, it is because our players need confidence. They need to feel good feelings with the fans because, maybe, they are a little anxious, nervous. That is normal.
'My plan is to maintain good football but without conceding goals.'
Since leaving Leicester in 2017, Ranieri had a short unsuccessful spell with French side Nantes but was keen to return to the Premier League.
Fulham spent close to £100million on signings in the summer but sit bottom after six successive league losses and have conceded 31 goals this season.
Ranieri has promised owner Shahid Khan that they will survive and the Italian reiterated that belief at his pre-match press conference.
Explaining why, he said: 'Because I know my players. Before coming, I watched matches and said, for me, this is a good team. They lack some energy, something that I can give to them.'