I post it here instead of in Jira, because it's plain evil, in a funny way :).
Imagine you have this code:
This code won't compile, but Intelli doesn't report an error about it. What happens, is that \u000A is interpreted by the Java compiler as a newline, thus producing the following code:
This, ofcourse, does not compile. It would be nice if IntelliJ would mark this as an error!