Our cranky day cure/wild craziness overload neutralizer/"boredoom booster": Color baths!
All you need is a bathtub, water, and various flasks of food coloring. Seeing how the water changes color from blue to green, or from red to orange, etc is a big hit with the 3-year old. She usually thinks she is a mermaid bathing in "magic water"...
What's an easy activity you do with your kids on a cranky day? (I need more tips, we've been having a lot of them lately.)
To see a helpful list of tons of other "boredom boosters" for miserable weather and the like, click here.