(ERASED. WTF, I only noticed this now in 2012. WTF)
Things I do now:

• I run around the house naked.
• I eat raw Milo.
• I poke my officemates' armpits every time they yawn.
• I throw random objects at my friends.
• I sometimes hail a cab and as soon as they approach me, I run away.
• I make paper boats and paper airplanes while listening to our pastor's sermon.
• I purposely piss people off in various online forums in order to stimulate debate.
• I jokingly insult strangers in IRC in order to observe their reaction. We often end up becoming friends anyway...

And many more...

Things I did when I was young (around 3-7 years old):

• I wanted to know how being electrocuted feels like, so I partially plugged our electric fan to the socket, and touched the xposed metal.
• (ERASED. WTF, I only noticed this now in 2012. WTF)
• I felt that every object, animate or inanimate, has a life. Example: when I see a car, I don't see it as simply a car. I see eyes (two headlights), a mouth (bumpers), and feet (wheels).

And many more...

Other things that I used to do, when I was still in highschool:

• I touch every lamp post that I see.
• I "walk" around the neighborhood by simply visualizing my surroundings. I usually find misplaced items using that method.
• I write computer viruses on my spare time.
• I vandalize chairs.
• (ERASED. WTF, I only noticed this now in 2012. WTF)
• I disassemble and reassemble every object that I encounter: ballpens, TV, toaster, radio, etc...

And many more...