The Swiss franc just slumped in value against its major pairs. It's down about 0.65% against the dollar and 0.5% against the euro.
There's no immediately obvious cause for the slump, although Switzerland's central bank has been intervening in the currency market sporadically to keep the franc from appreciating too much.
Here you can see the franc - US dollar exchange rate plunge:
Investing.com
Here's that the other way round, as it's usually presented:
Investing.com