In the early days of my first full-time job I was friend's with a young woman who sang in her college choir. She had a great sense of humor and what she called 'Choir Howlers'.
The 'We like sheep' was considered a classic. The real line was 'We, like sheep...'
The opening of Carmina Burana became 'Oh for tuna, chunky tuna...'
A song from the pirates of Penzance became, 'A pair of socks, a pair of socks a very smelly pair of socks...'