Answer:
First Prompt: That would be a potentially risky desicion that could possibly affect my future in college. Some people in the world would die to go to college, so it would also be incredibly selfish to waste it away when I have that privledge and so many people do not. I wouldn't risk my opportunity to go to college just so I can be my friend's obsequious little helper in a buisness that most likely won't take off. And, depending on how successful it becomes, it might not make as much money as becoming a doctor, for example. I would decline my friend's offer in a heartbeat if it would interfere with my future.
Second Prompt: Well, I'd be utterly confused at first, but, if the person seemed benevolent, I'd most likely join in. After the song was over, I might yell down to them and reccomend another song that we could sing. Possibly a rendition of "Stand by Me", or "Bohemian Rhapsody". I assure you, it would be a thrilling experience, especially late at night. I might meet with the stranger in the morning if they were still located at the same spot, and we'd perambulate around the city and discuss our favorite songs. Now, approaching this from a logical perspective, they could have mental issues and you might want to have your best interest in mind before randomly announcing your presance to a stranger by singing "Happy Birthday".
Step-by-step explanation: