When you show up at your friend's house and ring the bell, make sure it's the right house. That felt like one of the most awkward moments of my life at the time. Another time when I was on acid I invited myself over to someone's house and ended up lying on his bed for 4 hours (I needed to grab weed from my friend who was over there)
No, another myth based on the fact that milk does help with some types of poison ingestion, but by the time you think to drink milk the LSD is already in your system and it certainly doesn't kill an acid trip.
If anything milk creates annoying pressure in your sinus with the mucus it creates. You will notice that even more on a trip. Best thing to help a trip is your set and setting and great music.