Advertizement fail: When the font(s) you choose for the name of your product are so fancy they are all but unreadable.
For instance http://www.kickstarter.com/projects/baudot/lyssan
The web browser tab tells me it's called Lyssan and that's the only reason I know the name for sure.
On the other hand, I guess I clicked through, didn't I? But only because I was irritated.