Why is Shahrukh Khan jealous of Sonu Sood

Why is Shahrukh Khan jealous of Sonu Sood
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Shahrukh Khan and Sonu Sood will be seen together in Farah Khan's forthcoming film Happy New Year (HNY) which also stars Deepika Padukone and Abhishek Bachchan in the lead. And though SRK and Sonu get along really well, we have learnt that the former is quite jealous of the latter one. Is there some kind of animosity between the two which we aren't aware of? Not really. Interestingly, Shahrukh thinks his HNY co-star pulls off grey shades very effortless and that makes him go green with envy. At a recent event, the Dabangg baddie said, "when we were shooting for Happy New Year, Shah Rukh told me that 'I get very jealous of you when you do negative roles and I also want to do an out-and-out negative roles without any songs."
Even wethinks Sonu does justice ever time he plays a villain onscreen. But we would love to Gauri Khan's hubby do the same on the big screen. After all, he did a fantastic job playing a baddie in Darr. So we would certainly like to see him walk down the same path. What about you Bollywoodlifers?