Any game where I have to gather wood (Age of Empires, Galactic Battlegrounds, etc) I would always feel the intense need to clear cut the forests around my base using villagers, trebuchets, etc. Why I felt the need to see cleared land.... no idea. My subconscious timber tycoon, maybe?

Also in games where I have flight capability - sending whatever to every corner of the map so there's no fog of war - usually leaving one enemy unit to keep the game going...