There's a few acceptable ways to give someone a pie and none of them involve launching it in their face. Even if it wasn't annoying, it's a waste of pie.
While the previous episode "Cart Before The Ponies" had a questionable moral that a lot of people found annoying because of the way that the main six acted in it, I could still enjoy it for what it was. This episode, however, bored the heck out of me the first time I watched it. While there have only been a few other times I was certain of what was going to happen from the first five minutes - I've never been right about it before.
Thankfully, Bright Idea was around to make watching the episode a little less monotonous.