Not just this, the induction motor joke, the pencil in the space joke, I dunno about you, but I got all these jokes in emails or SMSes. I am sure the creative writing team of 3idiots brought all such mails together like the pizza toppings, put it on the base made by Mr. Chetan Bhagat, branded it with Aamir Khan, increased the temperature by putting hot female actor and delivered it to the audience! Now, the pizza is making a business worth crores of rupees all over!
Yes, many things were original in the film. But as it is known, people only see what is wrong. Still, movie is doing well, so nobody is bothered about it. Aal izz well!