There's a word for these: Mondegreen. I learned that a few years ago on Randy Bachman's radio show, the Vinyl Tap.
It dates back to November, 1954 when Sylvia Wright published a piece in Harper's about mishearing a song in her childhood. When she was young, her mother would read to her from the “Reliques of Ancient English Poetry,” a 1765 book of popular poems and ballads. Her favorite verse began with the lines, “Ye Highlands and ye Lowlands / Oh, where hae ye been? / They hae slain the Earl Amurray, / And Lady Mondegreen.”
Except they hadn’t. They left the poor Earl and “laid him on the green.” He was, alas, all by himself.
For those interested in such details, this neologism has been in the Oxford English Dictionary since 2002.
We used to do half beer and half sprite during the summer. It was oddly refreshing.My sister thought the part of Jingle Bells that went:
Making spirits bright.
Making beer and Sprite.
How a five year old knew about beer is all you need to know about her.