banana peel

noun2

1. •
   (US, Canada) The several outermost layers of a banana, especially once removed from the rest of the banana, which may be slippery if stepped on.
2. •
   (US, figurative) A cause of difficulty, or potential embarrassment.

   • We had the first black president, trying to bring home a victory on healthcare. I didn’t want to be a banana peel for him. — 2012