My mind is VERY busy, and when I do certain activities there are usually two thoughts that pass through my mind. Here are a couple of examples:
(Feel free to comment with examples of your own.)

When I run:
Thought #1 – Man, running sucks!
Thought #2 – Man, this feels great!

When I clean:
Thought #1 – How did this place get so dirty?
Thought #2 – This place looks so much better when clean.

When I fart (and no one is around):
Thought #1 – Oh my goodness, I should be ashamed of myself!
Thought #2 – Hey, that was a pretty good one! Wish someone was around to hear it.

When I play sports:
Thought #1 – This is so much fun, why don’t I do this more often?
Thought #2 – I’m so old and out of shape.

When I eat:
Thought #1 – This tastes great, but I’ve had enough and should probably stop.
Thought #2 – This tastes great, and I’m almost done so let’s have some more.

When I’m at work:
Thought #1 – Is it time to leave yet? Is the clock moving backwards?!
Thought #2 – I really appreciate this job and what it provides for me.

When I’m driving:
Thought #1 – Why don’t these people get off their cell phones and learn to drive? Move it!
Thought #2 – What’s THAT guys hurry? I hope he gets pulled over.

When the Packers lose:
Thought #1 – WTF?! This guy sucks! That guy sucks! What are they doing?! That guy should be fired.
Thought #2 – It’s only a game. It’s only a game.

When drinking:
Thought #1 – Ok, this is my last one.
Thought #2 – Ok, THIS is my last one.

When thinking about my life:
Thought #1 – Wow, I did a lot!
Thought #2 – Seems like I haven’t done anything yet!

Cell phone use:
Thought #1 – Why are people on their cell phones all the time?
Thought #2 – Let’s check the cell phone and see what’s happening.

Candy Crush:
Thought #1 – This game is great, glad I got into it.
Thought #2 – One more try and I’m done. Geez, I wonder how may hours of my life are spent on this game so far?

Coulda Shoulda Wouldas:
Thought #1 – I really wish I had done things differently.
Thought #2 – I wouldn’t be where I am today without lessons learned from the past.

Alcohol Butt (diarrhea):
Thought #1 – Gross! I really need to eat more or drink less when going out.
Thought #2 – At least I’m not puking!

White shirts:
Thought #1 – Love ’em, so fresh and clean looking!
Thought #2 – Hate ’em, too hard to keep clean!

Golfing:
Thought #1 – This is fun, I need to do this more often.
Thought #2 – I suck at this, why do I even waste my money?

Boobies:
Thought #1 – Boobies are awesome!
Thought #2 – Yeah, boobies are awesome!