Been so many years, I'm not sure! I think it was a rabbit with a 22 Ruger single six.
When I was a kid, my dad would take us to the sand pit and sight in his 30-30 to get ready for deer season, and we'd all do some 22 rifle and pistol shooting. Nobody wore hearing protection back then.
When I got out of high school, I got my first larger handgun, a S&W model 27. I remember my first and last trip to the sand pit with it, without hearing protection. I fired off many cylinders of 38s with no real discomfort. Then I decided to move up to 125 gr HP .357s. The first shot was like someone had slapped both sides of my head, leaving my ears ringing. Then, like the young dope that i was, I figured I might as well finish off the other 5 shots at least. When I got done, my hearing was muffled. I went back to my car and I couldn't hear the radio playing. My hearing gradually recovered over the next several days, but never completely recovered.
Since then, I have had a ringing in my ears when it is quiet. Also when it is quiet, I occasionally have an odd rustling sound that seems to come from behind and to my left. It can catch me off guard every so often when I am out hunting, making me think I can hear something coming. After I turn to the left a couple times, I realize it is just my ears playing tricks with me again. I also have a hard time hearing people when there is any background noise. If I am sitting in a resteraunt, or with a group of people, I can't filter out the background noise and other voices enough to hear the people I am with. If I look right at them, that does help. Guess I am partially hearing them, and partially reading their lips.
Since that day, I always wear hearing protection when shooting. Unfortunately, a bit like closing the barn door after the horses are out. Still, figured I should try to salvage what I have left. For a while I used plugs. Then I went to muffs. Now I wear plugs and muffs. The only place I don't is when I go hunting. I shoot a SRH 7.5" barrel when hunting, but shots are usually just single shots, and only perhaps one or two a year. That hasn't seemed to bother too much. The woods tends to soak up a lot of the noise. I tried Peltor electronic muffs when hunting, but I found them very hard to use. They pick up every little sound. I was not able to find a volume level that would sound normal. The slightest breeze or a squirrel would sound like a herd of deer coming!