natural contagions

Nothing better than when this spreads

You do it, your wife does it, the whole room does it

They ruminate, and your spiral downward 

The ones you can't get out of your head

Exercise, weights...

Going all in, a rope swing, roller coaster, or riding a skateboard 

"This list is terrific"

"Oh thank you for saying that, I might make another one tomorrow."

Things you can't take your eyes off. 

All those shiny objects that pull you from what's important 

Those great "why didn't I think of that" ideas you just can't shake.