An addendum: After some thought, I decided that the all-black bug did have wings, and the pincers on the back end were much smaller than the front ones. They may have even been able to retract slightly. Thank you for looking.
I Found A Long, Thin, Black Beetle In My Sink. It Has Pincers On The Front And Back Ends. Its Not An Earwig. We Have Earwigs Here And This Was Different.?
What you saw in your sink was a devils coachhorse beetle. Google a photo of it and check it out.