One of the few things all three have in common; the quinquagenarians are major fans of Queen Sridevi and have said so several times in the past in print, on TV, in interviews etc.
Salman Khan was such a big fan, he wrote the (awful) Chandramukhi and insisted upon producer/director Sawan Kumar Tak that he hire Sridevi for Chand Ka Tukda. Both were colossal flops but the fandom between the two stayed. Shah Rukh Khan was such a fan, he did an extended guest appearance in Army and Aamir Khan got Sridevi to appear on his TV show.
Just a random collection of the pics of Sridevi with the Khans here!