THE MISHEARD:

One kill makes you larger
And one kill makes you small

The story:

I was writing an e-mail about references to Alice in Wonderland in
songs and films and checked to make sure I had some other lines
of the song right. First, I though the lyrics site must be wrong -- it
makes so much more sense with pills, including the line that the
ones mother gives you don't do anything! But then I asked a couple
of people and they just stared at me like I had gone mad. One even
snickered. I've been singing it under the shower for years. Sigh. [Editors note: Someone convinced this member that "One kill makes you larger" were the real lyrics instead of "One pill...". Turns out, you were right all along!]