MGS3. The whole game was jam packed with them. My personal favorite was when I went to plant the explosives on the Shagohod and all of the guards were there giving me a hard time. I played it again (I can't remember if it was Sunday or a Holiday) and all of the guards took the day off!!
The picture of Mario from Mario 64 in the window of the castle in Legend of Zelda: Ocarina of Time made me smile, too.








