I am surprised that no one has mentioned one popularized by The Smothers Brothers many years ago, one which begins with this line:

  I fell into a vat of chocolate

Not surprisingly, I suppose, the various references to that line found by Googling the web disagree about the subsequent lines. However, there's a longer-than-most version as the last posting on this page. The writer of the posting, unable to locate the recording, reconstructed the song from memory, but the level of detail suggests that his memory might be quite accurate.