I just had that, and I'm pretty sure whatever caused it was not edible.
The foodstuff in question is "southwest dip" from a food establishment M and I visited a few days ago. It contained mostly black beans, some cheese and a crapton of jalapenos so I realize my taste buds might be slightly altered, and I'm trying not to freak about it, but that "odd" bite really tasted like it was spiked with a substance you would use to either a) disinfect surgical tools, b) poison your nemesis or c) scrub a toilet.
Needless to say, I have lost my appetite. I just hope I don't die before morning.