I have an interesting story about that...
This has been done by others in the world. But at a works do a couple of friends and i noticed the ample assets of a collegue.
After a few drinks i plucked up the courage to speak to her and the best i could do was:
" I bet you £5 i can honk your boobs without you noticing"
to which she replied
"Yeah right, i bet you can't!"
So i grabbed her boobs, saying HONK HONK loudly, and handed her a crisp £5 note.
"best fiver i've ever spent."
My mates were in stitches, but needless to say she didn't find it so funny.