I F**k You is a song made up by Barney when he was about to finish his god awful show Barney and Friends. Instead of saying I love you, he said I f**k you and kept doing it for the rest of the song. PBS airing have the regular I Love You song on their broadcasts. All swears that Barney said were bleeped out.
(The music begins)
Barney: I f**k you! You f**k me! We're a sh***y family! With a great big p**s and a s**t on me and you. Won't you say you'd f**ked me to?
Barney and the Children Together: I f**k you! You f**k me! We're best friends like f***s should be, with a great big s**t and a p**s on me and you. Won't you say you'd f**ked me to?