1. Having a pet.
2. Investing in a comfy couch.
3. Getting your own place.
1. Taking laxatives. Especially more than one. Ever.
2. Going to a party where the majority of attendees have been of legal drinking age for less than 5 years. Especially if there's beer pong. There will be puking.
3. Having your home 50% or more filled with pets.