When it comes to playing gags on people, I typically stink. However, the best one that was ever successfully pulled off occurred about eight years ago. I called up Jay in Seattle (the best gags always cross state lines) and filled him in. He phoned my house, posing as some one from the Virginia Beach Sewer Works, and this was a courtesy call. Due to some maintenance work, the pipes were going to pressurized and there was the potential for water to come shooting out of the toilet. What they were recommending was wrapping the toilets with saran wrap.
It was a theme and variation on the classic saran wrap the toilet bowl gag. Typically, the victim is someone going to the bathroom, not observing that there is a barrier between the commode seat and the bowl itself. This time, the trick was to get someone to wrap the toilet.
It worked better than it deserved. My in-laws were visiting and they assisted in making sure that both toilets in the house were secure. All the while commenting on the thoughtfulness of the Virginian Beach Sewer Works. The plan almost went nova, because they were getting ready to try and contact our neighbors just to make sure that they got the message. Thankfully, Jay called back to let them in on the joke.
They say that "hell hath no fury like a woman spurned." I am still waiting for the other shoe to fall.