This is either the best prank ever...or the best prank ever! If you actually went through with it, I applaud your commitment to the joke. And even if it's not a joke, it's still the greatest prank ever.
If you want tips on avoiding a Howler from your Grandmother let me know. Fuck knows I've managed to avoid a few of them in my time. It mostly includes setting it on fire before it starts shouting...dangerous though, so only attempt it from a safe distance of five meters.
I've enclosed some of our adult line of Wheezes as a wedding gift. The licorice whips are my favorite. You'll see why.