- A belly button.
- A wine stain on your shirt.
- Closed containers.
- A 21–year–old person's mouth.
- An old hat.
- Hospital Dixie cups.
- An expensive beer—people will assume you aren't a Penn student.
- A bucket.
- Cups, Mr. Balloon Hands.
- Water bottle—it's actually water, hydration is important when you're on ecstasy.
Photo credit: Flickr