I put my hand into my bra to adjust one of my forms.
Eeeuw! Sticky mess.
It had burst, and sticky silicone goo was now oozing out.
It's a bit like that slime stuff you play with as kids, and it will come off clothes and skin fairly easily, but I could have done without that.
It was an old, smaller form that I use with some of my older, padded bras, so no big deal.
Fortunately I wasn't anywhere public at the time.