GCN: I showed up at Wal-Mart at 6 PM, and was first in line. They gave me a numbered ticket around 6:30 and said I could come back at midnight. I did so and got my GCN first out of everyone. I played Rogue Leader until about 3 AM.
Wii: After the insanity that was the PS3 launch and everyone knowing that Wiis were limited in number, I showed up to the store around 8 AM. If no one was waiting, I would come back at noon, but if even ONE person was there, I would stay. One mom was already in line, so I decided to stick it out. The store only had about 25 Wiis, so by 11 AM enough people showed up. They didn't hand out any tickets or anything, so I had to wait all day inside the sporting goods section of Wal-Mart. It was pretty fun though, the people were nice and we played cards, DS, and dominoes. I got my Wii (which actually turned out to be defective after about two weeks), and played Wii Sports and Zelda until about 3 AM.
Brawl: I wasn't planning on going to a midnight launch, but my friends had to go to Wal-Mart so I decided to check it out. Sure enough, people were in line. I got there around 11 PM so I just waited in line for an hour and bought the game (and also bought my friends some of their groceries since they had to stay so long). I played Brawl until about 3 AM, went to bed, started playing at 11 AM, stopped playing at 11 PM. Then I saw through time.