This was during his song called "Cell Phones". The lyrics are:
"We all have cell phones
so come on let's get real
let's get real"
How can you argue with genius like that?
Other highlights include a strip tease during "You're Pitiful", an interviews with Madonna, K-Fed, Keith Richards, as well as singing to the ladies in "Wanna B Ur Lovr"
If you ever have the opportunity to catch a show, I highly recommend it.