The first one that came to mind was this really high, scary water slide that i tried one time. I wanted to, but didn’t want to do it, but it was now or i’d never be back to do it again, it was just scary.
Other than that, i suppose there are business opportunities that come along, and it’s obvious that if we don’t take it, we’ll miss it forever (it’s trading space opportunities, so getting the opportunity to trade in a particular shopping center and passing it up pretty much means we’ll probably never get into that particular center again, at least not within the next 2 – 5 years.
I don’t recall having many “now or never” moments other than these.