Back in April of 2012, The Slice asked if various groups or professions had superstitions along the lines of baseball players not talking about a no-hitter while their pitcher is working on one.
Fritz Stout had an answer that I used to finish a discussion of that theme.
And longtime mountain biker Fritz Stout said you absolutely shouldn't say things like "I can't believe nobody has had a flat tire" while a group ride is still in progress.
Fritz has sent me several other excellent submissions. But his bike stories are amazing, as you might suspect if you saw his collection of shattered helmets.