Your kids sound like mine. About two weeks after we brought our adopted sons home (5 and 6 six years old), they were playing on the wonderful new swingset we got for them. The really nice one, made out of cedar 4x4's. Older brother decided to play "helicopter" with the younger one - made him lie on his stomach on the swing and wound him up. Our neighbor over the fence said she heard something like a pumpkin being hit with a baseball bat and looked over the fence to see son #2 splayed out on the ground, out cold after spinning his head into the cedar 4x4. I always thought "goose egg" was a figure of speech - its not. We got some looks from the emergency room folks that day, but fortunately, my wife's sister is an ER nurse so we dropped her name and got a pass.
Sons 1 and 2 got into a sword fight with sticks. This time it was son 1 who made the trip to the hospital - impaled through the leg by the jaunty lunge of his brother. 28 stitches (including muscles!). Let's move on.
Innocent two year old daughter puts the eraser from the end of a pencil up her nose. Tweezers don't work. A straw duct-taped to the end of the vacuum cleaner hose didn't work either (that was my idea - I could have sworn that was going to do it...). Nurse at hospital teaches daughter to close nostril and blow. The eraser flew 15 feet according to the nurse. Not bad for a little kid.
Oh yeah - I forgot to mention the time that son 2 swallowed two pennies and started puking and choking in the back seat while I was driving 65 mph on I-95 with a big tractor-trailer right behind me.
I went noticably gray that very day, according to my wife.