Constant vigilance or they do crazy things? Too funny, like what?
My 2 yr old once took the keys to a Yukon (I could hardly hoist myself into it sat so high) locked himself in, started car, and LAUGHED at all attempts to get him to let us in! Same 2 yr old used to take gallons of milk, drag into living room and DUMP out on rug, feed every last hot dog in fridge to eager German Shepard.
At 20 mos old, used broom stick to get medicine off of back of counter, UNSCREWED child locked lid, and spent rest of day getting charcoal pumped into stomach at hospital. Ate Desitin too many times to remember, couldn't keep it in babybag.
At five, cut all hair off puppy, ummm many more stories, these are off the top of my head.
This is the ONE child out of four, he made me afraid to sleep.