They're both Beach Boys songs but sometimes I combine these two or sing one over the other: Little Honda and All I want to Do
That's pretty cool - which of those songs are you singing over the other? And what part(s) specifically?
I always sing "Faster, it's all right" from Little Honda at the end of the chorus of All I Want to Do. Don't remember the part, I'll listen to it later and edit this post.
EDIT: Near the end of the chorus right before Mike's last line.