Jigar Muradabadi wrote a Ghazal in which one of the couplets is:
kyaa husn ne samjha hai kyaa ishq ne jaanaa hai
ham Kaak nashiino.n kii Thokar me.n zamaanaa hai.
All Nasir Husain films used to begin with this sh'er.
Majrooh Sultanpuri used it in the beginning of the title song/qawwaali of Zamane Ko Dikhana Hai (1981):
By the way, there is another very famous couplet in the same Ghazal:
yeh 'ishq nahii.n aasaa.N, bas itnaa samajh leeje
ik aag kaa daryaa hai, aur Doob ke jaanaa hai
Do you remember any song that uses this couplet?