Users usually find it really annoying to have to say they are sure when deleting an item, for instance. Some authors argue that we can totally remove this confirmation dialog and let the user ctrl+z if a mistake is done.

Netflix does it in a very elegant way.
If you want to delete a movie from your cue, you can just do it without having to say you’re sure. That row, instead of disappearing immediately, turns to gray and provides an “undo” link in the same place where the “x” for deleting used to be. Another delighful UX!

Before deletion:

After: