A childhood belief about misheard lyrics

When I was younger and my friends came over I wantd to act cool and know all the words to a song they liked soo when they played it and they were singing I would say the last word of every line and it would look like i was singing it

What is funny about this is that now when my other friend come over not the same one thought she does the same thing but she thinks i don't notice it but i do!! :p