Remember though, that the best ideas initially sound like really bad ideas, as explained by PG in his essay (based on pretty good empirical evidence from funding hundreds of them ):
http://paulgraham.com/swan.html
So there could well be a few outliers in there.
Of course, that is a necessary, not a sufficient condition, i.e, not all bad ideas are going to be successful - but the most successful ones sound like really bad ideas to begin with.
https://news.ycombinator.com/item?id=3053883