run with scissors

verb2

1. •
   To behave recklessly.

   • It is dangerous, dumb, and highly delinquent (CRAZY) for a professional educator to goad our poor little misunderstood and hormonally-challenged children to run with scissors. — 2008
2. •
   To take a calculated risk.

   • Fly solo. Sure it’s safer to go with a partner, but every once in awhile^([sic]) you have to run with scissors. — 1998