I did something funny today... you can try doing it too.....
All you need for carrying out this prank is a junior who you are friendly with, but can boss over a little bit too.
I was hurrying for college when I noticed this junior (who fulfilled the above two criteria quite well) just ahead of me. As I liked his company, I thought I should talk to him. However, at that time I had not thought about the prank. The idea came spontaneously.
As I turned around to face him, I saw his cute and innocent face. This aroused the devil within me, and I asked him a question, "So how is your girlfriend?" A cute kid like him was inclined to have a girlfriend, but I had no previous idea whether he actually had one. Faced with such questions, people usually evade the topic or behave as if they have never thought about girls in their life. Likewise, my junior appeared surprised and his innocent face had "Me and girls? No way!” written all over it. It was possible that he was so straight that he had no girlfriends, but I still persisted, "I saw you the other day with a girl." Now, given that I was seeing him after a long time and that he and I resided in the same city, the probability of such an occurrence was not too low. So I poked him further about when and where I had seen him, with fictitious details; "It was in the middle of December.... In South Calcutta.... I don't remember clearly. Probably Rashbehari." I kept my details as general as possible.
Luckily, the "Rashbehari" arrow hit the target. By now, the junior's expression had changed from one of angelic innocence to that of slight unease. He said, "You might have seen me there as I use the Rashbehari Metro quite regularly." Grabbing the opportunity, I hurled a barrage of questions at him, "So what wa, the girl's name? Is she your girlfriend?" After all this, my junior assumed that he had actually been spotted by me while he was roaming with a girl. With a guilty face, he divulged everything, "She's just a friend. Her name is A***".
I left him and had a good laugh on the way to college. Maybe I can get some more details out of him next time. So don't tell him about all this just now ;-)