How to get women to expose their armpits?

1. Tell her that something is sticking from the back of her hair-do
2. Tell her that her hair-clip is coming out loose.
3. Throw a baloon to her at a height, and ask her to catch it (it may be possible only in a party).
4. Ask her to hang or stick a picture high up on a wall.
5. Ask her to get something from a high shelf.
6. Ask her to play with a baby, and tell her that the baby loves to be held lifted up high frequently.