Help Me Choose the Flickr Group Roulette Picture with Caption of the Day....

I participate in Flickr Group Roulette (one of the ways I keep working to improve my photography skills) and today the challenge is all about thought bubbles. I took some photos, created some bubbles and as usual, over shot. Help me out, please, and tell me which one is YOUR favorite (or possibly suggest a thought, too!)

Here is #1

And #2

And #3

And #4

And #5

Last, but not least, #6