Good idea to ask someone to prom?

I was asked in a weird way but it was cool: I was leaving work, n there was a letter on my windshield telling me to check my mailbox when i got home, lol, it was a goose chase of letters leading me to him standing in my yard with flowers n he gave me a box....asked if i would go to prom with him n told me to open the box before answering him......i opened it n it was a whistle, lol...I laughed n he said ok, now, dont blow it....just say yes...i said yes...