I wouldn't say bad experiences, but certainly some really scary moments and some scary falls as well. They come with lead climbing and are part of it, but also part of the rush. When you are climbing a few meters above your last protection point and fall, you have twice that distance to fall before the rope even starts to tension, so sometimes up to 10m fall and honestly, that can really scare the dickens out of you (I've never had quite that big of fall, but still some really scary ones.

I've had a few times when I get up to an anchor on a really hard climb and my mind is just numb from adrenaline, I have to hang there for 3-4 minutes to get some blood cooled down so my mind works again to thinking about how to safely build an anchor. That is my scariest moments as you are just hanging there, thinking "What the HELL do I do now?" and my mind is blank. Happens once each day to me, its weird, but thankfully I can stay calm, its never make me do anything stupid or panic. A fun scary if you know what I mean. Same with the height, its scary but exhillarating!