I would say "thank you!"
I'd accept it thankfully. .... and ask for seconds, please. LOL
I'd tell them my usual fee is $200.00
I initially thought that my reaction might depend on whether I was simply an observer (watching someone be handed $100) or the person being handed the $100. On second thought, I would likely have the same reaction to both scenarios - as described by others (surprise, suspicion, gratitude).
I'm with Lilt!
And mini and xuan...
That we do! :)
I would smile and say thank you..
Honestly, my first impulse would be to wonder if I looked like I was down on my luck, thank them and refuse it.
I don't really believe in karma, but I have a karmic mindset nonetheless. I'd feel compelled to use the money for something genuinely beneficial to myself or others, so as to honor their goodwill.
I would take it and go buy some beer :D
Lol, you bet your bum!
I did that once - gave someone $100 just to make their day.
Rob them. Chances are there is more where that came from.