multivac I love that one.
You lot would find DD2's and my goodnight routine either charming and hilarious or completely nauseating, depending 
Me: Night night, love you
DD2: Love you too
Me: Love you more
DD2: Love you most!
Then we have to do it the other way around so I get to go last and say the "Love you most" part.
DD2: You da best
Me: Budapest
DD2: Budapest
Me: You da best
No idea where that came from. Although I did live in Budapest for a couple of years in my 20's.
THEN (it ends soon, I promise), we need to do the bedbugs rhyme. For this one it doesn't matter who starts:
Me or her: Goodnight, sleep tight
Her or me: Don't let the bed bugs bite
Etc: and if they do
Take your shoe
And beat them till they're black and blue
And flush them down the loo
Woo-hooooo!
And then finally I say "Goodnight my beautiful girl" and she says "Goodnight my beautiful mum"
Not one word of deviation is allowed.
She's almost 11 