1. Dean knows how to take apart, clean and reassemble his gun with his eyes closed in under 5 minutes.
2. Dean knows Sam chews his thumb when he's reading and thinking at the same time.
3. Dean knows how to kiss like that...
4. Dean knows all the words to every Led Zepplin, AC/DC and Metallica song ever written including the bootleg stuff they never released.
5. Dean knows he won't live to see 30 and he thinks it's ok.
1. Dean doesn't know to ask for help.
2. Dean doesn't know that it isn't a sin to.
3. Dean doesn't know if Sam came back the same.
4. Dean doesn't knowwhy his father ever thought he was worth the trade.
5. Dean doesn't know what Sam is willing to trade.