For the second game running, Jose Mourinho did a 'three finger gesture' to the opposition supporters after their chants towards him.
The visiting Juve supporters sang Mourinho s*** man" and "Mourinho son of a b****" at the Portuguese, who managed the Bianconeri's rivals Inter Milan for two seasons between 2008 and 2010.
During that spell in Italy, Mourinho won the treble with Inter in the 2009/10 campaign and instantly reminded Juventus supporters by putting three fingers up while still keeping his eye on the play at Old Trafford.
Mourinho's antics follow on from his trolling of Chelsea supporters when they chanted "F**k off Mourinho!" at their former boss after the 2-2 draw at Stamford Bridge on Sunday.
The 55-year old was of course referring to the three Premier League titles he delivered on that very same pitch.
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