We should share, right? I loved all of your samples, FSM. I think in the first one though, I would just remove the comma - the sentence flows better without it, I think.
Even though I felt sure to my bones that I was about to experience my best evening in years, there was only one thought that kept repeating in my mind: when did ketchup become such a culinary staple?
This was a moment of potential infinite regret... the kind that comes along maybe twice in a lifetime. I knew what I had to do. I knew that if I didn't do it, I would be haunted for the rest of my life by my lack of action. I also knew this was going to go terribly, terribly wrong.
(sorrry, that was a paragraph, not a line.)
She could barely conceal the gleeful smile she felt tickling at her lips knowing that this was the last time he was ever going to get the last word.