I'm sure I once blogged about a clever tactic I used in my years of work at Exxon Office Systems. I had a reputation as a reliable hard worker. That meant that on rare occasions, I could accept an action item for something I hated to do, and then just not do it. I always got away with this, by the way. No one ever noticed; and if they had, I would have played for time by saying, “I sent you an email. Didn't you get it?”
Now I have discovered a vaguely similar tactic, but I have no use for it now. I hope it's helpful to some of you.
Let's suppose there's someone you need to contact by email. You tried twice (no response), and you fear trying again, because you don't want to seem to be bugging them. So you address them on some irrelevant email that was obviously intended for another person. There should be some name-similarity so that it will be obvious you just hit the wrong name in your address list.
After they send this irrelevant email back to you, telling you that you mis-addressed it: voila! You're in touch.