If you love me and you know it, clap your hands.
If you love me and you know it, clap your hands.
If you love me and you know it, then your face will surely show it.
If you love me and you know it, clap your hands.
Other verses:
Say, "I love you"
Blow a kiss
Give a hug
See also: If_You're_Happy_and_You_Know_It (with video!)