Bossa No. 6
Based on cryptic download stats, this song remains popular after it's conception in November, 2005, as a KVRAudio contest entry (the theme was "Easy and Cheesy in the Retro Lounge" and, against all odds, it won).
I originally intended this to be a parody of Mambo #5 (hence the title), but I found myself incapable of doing that. The phrase "Falling down a flight of stairs catches you unawares", however, was stuck in my mind at the time and I found myself more than capable of writing a song all about that.
Anyway, this song is dedicated to all of the Mrs. Fletchers out there who have fallen and can't get up.