Soooooooooooo, I went to an orphanage in Mexico this summer for a mission trip and was sitting on a toilet, pooping (of course) in 100 degree weather, and I started to sing. As I sang a low E flat (approximately 77.7817 Hz), my melodious singing became instantly louder. I screamed to myself (in my head) "RESONANCE!!!!! I LEARNED THIS IN PHYSICS WITH MR. E!" So naturally, I had to clue you in to my findings. I can officially say that I went to Mexico, and found the natural frequency of a stall that I was pooping in. Thank you Mr. E.