A few of my more memorable ones...
When I was 13 a mouse was running around the house, I attempted to capture it with a glass cereal bowl - and accidentally decapitated it. Oops.
Later that same year, winter, family and i are sitting round the roaring wood stove watching TV, when this gods-awful clawing, screaming, skittering sound was heard, falling down the chimney into the stove, lasting some 5 minutes - even the St Bernard had no idea what to make of it.
As an adult, I was driving an old aspen station wagon down the highway, came up over a hump and right into a flock of suicide birds, those little guys that like to collect on pavement. after a large number of small thumps (felt and sounded like the car was being hit by several paint guns on full auto), the temp gauge started climbing. I stopped at a gas station, found the rad packed with beaks and feathers; stopped counting after i think 20 beaks. Stank too.
The best, though, was when I was working for my dad, doing carpenter's helper - he had a contract to build a new roof on a house. I was on the roof using a 2.5" air powered coil nail gun; normally the air pressure is set to 80PSI to keep from driving the nails too deep. Well, this one blasted seagull decided to take exception to me being on the roof, and repeatedly dive bombed at me, swooping and screaming. after the fifth time of this, I shouted at my dad to crank the air pressure to full (130PSI); while I reloaded, wired back the safety and waited. The seagull came at me again, so i waited until he had swooped over the adjacent swamp (so as to not risk projectiles harming anything), and opened fire. Took about 40 rounds, (air guns aren't so accurate at 50 feet) but that gull went DOWN. Have I mentioned I hate seagulls?