I looked for an existing thread, but surprisingly couldn’t find one!
Did this the other day:
Not so Mighty Flea, on Flickr
I was on a balcony, and I tried to adjust the string tension, by pulling on the center string in a thumb mount. Bad idea, it popped right off and jumped off the string! I tried to stop it from falling off the balcony. I succeeded in that, but stomped right down on it, and… 
Show some of your damaged yo-yos!
Eeek and that thing is steel, too…
I know!
ripppppp
Sorry about that! Can it be fixed?
I think, with a new axle for $2. The bad part was that I had just ordered something the day before, and could have added it in.
RIP Mighty Flea. Thou shalt be remembered in our hearts always.
What shoes were you wearing that could do that? 
(something steel toed? Heh heh)
Looks like the mighty flea wasn’t so mighty after all…
The instructions clearly state: “Do not smash under foot” but it’s in fine print and in German so…
Hiking boots…
Ahhhhhhhhh!
That makes sense!
My running shoes wouldn’t do that unless I stood on one foot and jumped on the flea for a few minute. 
Well, the best yo-yo store in the world is taking care of me! 
Back in business/good as new!!! 