What is your biggest regret (purchase or non-purchase)?

I have two regrets: 1. how much time I've wasted playing this game
2. That i didn't start sooner!

Lol I'm kidding. Actually i had one real regret, buying the mutant rabbit, because you couldn't store it and it was multiplying out of hand. But they fixed that, it's storable, and now he just eats toxic veggies anyway. So no real regrets short of accidental donut task rushes because of rushed tapping.