This is the trouble with cheating: there are no acceptable rules, or laws. It could be a smile, or dancing to a song that you considered to be indefinably 'ours'. It can feel like cheating to go to a restaurant that you used to go to with someone else. Keeping photographs of exes can infuriate, like retrospective cheating.
Some things are very low profile, but if they excite me creatively, I accept them. Sometimes there are high-profile projects, and you have to do it. We all have human limitations. It is a painful decision to turn things down. Even accepting 'Slumdog Millionaire' was a decision that I had to sacrifice another project.
'Star Trek' put sci-fi on the map and changed television, and 'Battlestar' has changed it in another direction by making it a little more mainstream and acceptable to people who wouldn't normally watch sci-fi.
Catholic schools in Indonesia routinely accept non-Catholic students, but exempt them from studying religion. Obama's school documents, though, wrongly list him as being Indonesian.
What's so great about Sundance is that they only accept such a small handful of films per year for dramatic competition, so you know when you're going to Sundance that you're going to see top-quality projects.
The first thing I wrote was a one-act play that got accepted at a one-act play festival, and I was in it along with Nathan Lane and a couple of other very good actors.