While re-installing my front wheel after changing the tire, I stripped out the threading on the axle.  Now I can't ride until I get it replaced, and have been kicking myself ever since.

Anyone else have stories of parts they ruined through stupidity?  Come on, make me feel better. 

Yes. I am the king of AADD (Adult Attention Deficit Disorder)... so I work on a lot of projects at one time. I've gotten over the ruining parts phase (although I did overtighten my seatpost clamp on my street bike and it broke - cheap stock part from Danscomp) from working on motorcycles.

I have boxes and boxes of bike parts that are in perfectly good condition. I buy stuff, don't like it, and then put it in a box. I do this with a lot of stuff (motorcycle stuff, too), so I try to sell it on eBay to get back at least some of the money I spent. It's a horrible thing to do... I'd rather have that money go into my IRA account.

I'm going to have to gather everything and make a "lot" auction of BMX and road bike parts.

I flipped flopped my hub internals on my Nankai once and for 3 hours couldn't for the friggin damn life of me figure out why it would not engage! I was getting pissed and wanted to whip wrenches man!! lol

So finally after all else fails I flip it around and it worked. 

I now run a Geisha but that has absolutely nothing to do with anything here but I needed a random comment for the day.

Knocking in bearings and chipping or scuffing the frame sucks 10 fold. Anyone with me. Aaarrgghhhh!!! Now I know why park tools cost so much. Cause they're worth it.

i once forgot to put the driver bearings back into a nankai and then the guy whose hub it was rode it for a week the whole time wondering why the hub wasnt working that well and making a nasty crunching sound. it wasn't untill i cleaned up the mess from fixing the hub (a week later) and found the missing cage that we worked out why it was rooted.

Duno if this counts, but I was doin McCircles in the street, and I got too close to the curb withough knowing it, and I smacked into it backwards, and the bike like flipped over me, and I landed flat on my a$$.

while replacing my front axle i smashed the bearing with a screw driver while trying to get it out.

Yesturday I let my bike fall to the ground instead of catching it - I was frustrated.

When it hit, the nut ripped straight off the rear axle - I was lucky it was the nut that stripped and not the axle.

I didnt know untill now, but the rear nuts arn't screwing alot onto the axle due to my washer setup (long story) - so I guess in a way its good its warned me that my axle could break, but bad cause I need to find a new nut.

Goddammit.