Unclear on the Concept

My friend Rachel, Auntie Rachel to the kids, spent the night with us on the way from Denver to Chicago and got to spend a little time with the kids the evening she arrived. Knowing how the kids love/hate Lady Gaga, she told them this joke-

Q: How do you wake up Lady Gaga?
A: Poker Face.

Dave wasn't home at the time, so Will wanted to be sure to tell him the joke. He got the opportunity the next day when Dave took the kids to the zoo. I went like this-

W: How do you wake up Lady Gaga?
D: How?
W: Poke her in the face!

then

W: How do you wake up Miley Cyrus?
D: How?
W: Jump on her back!

Then Catie got into it-

C: How do you wake up Justin Beaver? (she's so cute)
D: How?
C: I don't know!