Commit masks remind me of that time I couldn't run a Java app because it assumed a specific classpath order, but the classpath order is random on each boot, and my randomized classpath makes the app crash.

I've also seen some development teams rely way too much on IDE plugins to get anything done. Horrible software architecture with a 45 minute start-up time, I shit you not. They paid a shitload of money on software licenses for a special JVM/IDE plugin combo that allows them to hotswap almost everything to avoid ever having to restart the app during development.

Oh, it's also pretty much impossible to launch the development version of the app with a stock IDE due to the sheer amount of runtime code modifications from IDE plugins the development version depends on. Great times.