WTF Joke Of The Day #20

Question: Three cockroaches were crossing the road. Suddenly one of them saw a poster of the Ranbir-Katrina starrer 'Ajab Prem Ki Gajab Kahani' and started singing "Tera Hone Laga Hoon". As soon as he did this, the other two cockroaches next to him died instantaneously. Why?? 

Answer: Because the song is a HIT! :D