$ svn ci -m "Commit some stuff"
Sending        foo
Adding         foo/bar.php
Adding         foo/baz.php
Adding         bar/quux.php
Sending        quux.php
…
Transmitting file data .svn: Commit failed (details follow):
svn: While preparing '.' for commit
svn: Directory 'foo’ is out of date
$ svn up
At revision 32439.

And then the commit works. Because, you know, you have to be at a revision with no changes at all vs. your current one to commit a file.

So stupid.