My kind of thread. Let's see...
-Using a monkey as a monkey wrench in Monkey Island 2
-Convincing George Washington to chop up a tree by painting a Kumquat tree so that it looks like a cherry tree in order to free Laverne in the future in Day of the Tentacle
-Gradually undressing Patti to use her clothes as objects in Leisure Suit Larry 3
-Defeating the dragon in Uninvited