In terms of performance, something unexpected is always good, it's preferable if it's unexpectedly good. But unexpectedly bad has a lot to say for it as well. It's always nice to be able to look back on a show and say, "Oh, that's the night that this happened," and a lot of the worst memories are better than the shows with no memories. A good rehearsal is a lot harder to describe. A lot of rehearsals that end up feeling best are the ones where something really bad was happening, and you just kind of got past it and fought through it. Just dealing with things that are inevitable.