With just a few simple household items, you too can transform yourself into any role we might desire. Here are some favorites:
Mary and Joseph: Drape a blanket over your head. The style of the blanket does not matter; yellow duck print is just fine. However, if you are playing Joseph (being D2) you must insist on the blanket going down to your feet, whereupon it will trip you up, fall off, and you will have to ask for it to be put on again.
Uncle: Wear a watch. It's best if you have swiped this watch from an actual uncle.
Missionary: Wear a baseball cap backwards. (No, I have no idea why this works.)
Since some people don't fully appreciate role-playing, it's easier if you skip acting things out and just run around announcing loudly who you are.