I was reading a little about Krakatoa earlier and I discovered that the tsunami it created when it went off in the 1880s destroyed a coastal town in Java called "Anger". And it occured to me that this might be where the phrase "Don't look back in anger" comes from. Because if you looked back you'd have lost valuable running time and might have ended up dead. It sounds plausible to me. I've so far failed to find any evidence one way or another though.
Tomorrow: What is a Shakermaker?