The Sweetest Lullaby

There's seriously something wrong with my big sister. Everyday before nap time and before bed, we each get to choose a lullaby before going to sleep. Sometimes we hear "Twinkle Twinkle", "Berceuse en bois", "Itsy Bitsy Spider", or even the very very different "Big Fat Spider". We can choose any song we would like to hear. Well, about 4 or 5 days ago, she started with an odd choice.

Maman: What song would you like?
Me: Je t'aimerais toujours
Maman: And what song would you like?
Sis: Soccer

Well, you and I both know that "soccer" actually means that she wants Mommy to sing Poker Face by Lady Gaga:


Now, there are a few confusing issues here:

1) Where on earth did she hear this song? We don't listen to the radio and neither Mommy nor Daddy has this song anywhere in the house.

2) Why would she decide that this is a relaxing song to be used as a lullaby? I mean, who can think of sleep when Gaga is dressed like that?

And finally,
3) How is this song referred to as "Soccer"?

Now the sad part to all this is that Maman doesn't know any of the words other than:

P-p-p-poker face, p-p-poker face
(Mum mum mum mah)
P-p-p-poker face, p-p-poker face
(Mum mum mum mah)

This takes her all of 10 seconds to sing and then she moves on to a more appropriate lullaby. I sure hope this "Soccer" phase doesn't last long cause if I have to hear that too many more times, I'm sure gonna poke her face...