Take off their shoes.

Put glasses on.

Check their tissue supply

Go to the Ladies room.

Visit the ladies room
Visit the snack bar

Count me in the "ladies room" crowd.

Pile all the, um, ahem, "illicit snacks/candy?" (read, not bought there!), into her bag.

Send someone else to the snack bar!!! ;-)
Talk about what other women are wearing.
Look around to see if they know anyone in the theater.
Unsnap their bra?
Unbutton the top button of their pants?
Brush off the seat they're going to sit in?
Put a towel down on the seat they're going to sit in?
Kick the empty popcorn bucket underneath another seat so it doesn't look like they left it?

dees, that's quite a list, you covered just about everything!

Wear waterproof mascara (I've been known to look like a racoon after a tear jerker)

Read a review or the book first?
Change seats?