Disco Bunny, how we don't talk anymore

The story:

Actually it was a co-worker walking around the office singing the song becaue he heard it on the radio in the morning. I thought I heard him say Disco Bunny, so I stopped what I was doing and listened carefully. I couldn't help but laughing out loud and he asked what I was laughing at. I laughed as I told him and he blushed and then started to laugh himself. He truly believed that Disco Bunny were the right words - I still laugh everytime I hear the song. (I'll put his age in.)