The mouse-over text for the delete or undelete link on a user's own question or answer confusingly states “Vote to (un)delete this post”. Clicking the link performs the expected action (message asking only "Delete this post?") but the tooltip is misleading, since the vote is binding.
Apparently, this was fixed in 2013 (set to
status-completed) so I presume some sort of regression crept back in.