Two that I remember to this day, they were NyQuil dreams...
I was running from Government agents in a circle out in the street in front of my grandmothers house, when I needed help and Abe Lincoln jumped off a penny and started running next to me, saying "we'll never get away from them!"
And...
I was in my bedroom, when something started banging on the wall in my bathroom. John Popper from Blues Traveler busted through the wall all pissed off, suddenly a large pig came trotting into the room wearing a sash that said "anti-drug pig" and attacked Popper while he was playing one of his harmonicas.