Impromptu Magic Night

If you were caught out at a friends house or in a bar or restaurant and asked to perform some magic when you had nothing prepared or with you. What would you do? All that will be available on the night will be the sort of things you might be able to borrow at short notice. A pack of cards (they may not be a full deck and may be in a bit of a state), some loose change or notes (money), paper, string, paperclips, box of matches, book of matches, pen, a glass, handkerchief and some rubber bands. Show us what you can come up with using any of these items.