Which couples have the best onscreen chemistry?

For me, it's definitely -

Kajol and Shah Rukh Khan - I think they're hands down the most popular couple in Bollywood, these two make dancing around the trees look like a dream. This couple also ensured that a guy and girl can never be friends, lol. They have set the bar so high that it's almost impossible to match!

Aishwarya Rai and Hrithik Roshan - Guzaarish, Dhoom 2 and Jodha Akbar are examples of how good these two look together!! Aish and Hrithik make the best looking couple on screen!

Which couple has the best onscreen chemistry according to you?