You need to be there when your baby is old enough to get laid

The story:

It was my friend's mistake.
We were singing and laughing in gym and the song was playing as we ran a few laps around the gym, and she belted out "You need to be there when your baby is old enough to get laid!"
And all of us froze and the teacher hit the sterio off, and all of us stared at her, and then started laughing.
She looked so confused I pulled myself together enough to tell her the real lyrics, at which she joined in the laughing.