"squirrel" fever?
Scotjute- I used to hunt my dad's little place in Kentucky with a beat-up old Brazilian over-under 12 gauge marked "S.S. Kresge" (K-Mart predecessor) that I bought (heavily) used off a guy for $50. The gun has bottom barrel full and top modified chokes. I generally used a light field load of #7-1/2s and used only the modified barrel on treed squirrels. One time all I had was a box of high-brass #9's I had leftover from a dove-hunting trip down here in Texas rice fields. For some reason I had loaded chambers on both barrels, and in my excitement and subsequent confusion touched off the full choke barrel at a medium sized gray in a sycamore about 20 feet above me. Down came twigs, bits of flesh, blood, and fur and finally one horribly mangled gray squirrel. The thing spun and tumbled, shedding parts on the way down; it looked a little like a WWII fighter hit by large caliber antiaircraft fire.
I put the pitiful remains in my game pouch anyway, and continued my hunt with somewhat more success, getting 5 or 6 more in the next couple of hours. I was back at the barn and had cleaned the better squirrels, and was trying to decide what the heck to do with this thing that resembled a furry bloodsoaked gray dishrag. It was a fairly nasty sight. The problem was solved when one of my mother's barn cats dashed up, grabbed a hold of the critter, and dragged him under my dad's old toolbench at the back of the barn. The cat stayed crouched under the bench, ate that sucker bones, fur, and all; he growled at me and gave me dirty looks the whole time. Well, at least no game was wasted.
Oleg- I started using a Ruger 10-22 with stock sights on squirrels right after that, and only on ground shots. Still have that old shotgun, though.