Sajid has included a few of his famous one-liners and dialogues from his TV show that was aired in the 1990s in his forthcoming comic caper that features Saif Ali Khan, Riteish Deshmukh, Ram Kapoor, Esha Gupta and Tamannaah.
"'Hum paagal nahi hain, hamara dimaag kharaab hai' is a dialogue that was used by Sajid himself when he was part of the TV industry," said a source.
"The very lines were uttered by him in English in the famous TV series from the early 1990s 'Mai Bhi Detective' and later on in Hindi in the popular TV comedy show 'Sajid No.One'.
"When he was making 'Humshakals', he realised that those lines were very apt to suit the character of Saif and Riteish," the source added.
Produced by Fox Star Studios and Pooja Entertainment, "Humshakals" is set to release June 20.