10) Watch the bag fill.
9) Hyperventilate.
8) Pull the tube out of the bag and drink from it.
7) Race to see who fills their bag first (requires 2 or more people).
6) Puncture the bag near the top and see whether they pull the needle out
of your arm before the blood squirts out.
5) While they're not looking, substitute a bag of orange liquid and
complain they gave you too much Tang.
4) Insist that you want to give 2 pints.
3) Faint.
2) Tell them you saw the bag twitch.
1) Yell, "Hey, you used that needle on the last guy!"