Yield curves have gone mad. Negative yields are everywhere, from AAA-rated government bonds to corporate junk. Most developed countries have inverted yield curves, and a fair few developing countries do too:
(chart from worldgovernmentbonds.com)
Negative yields and widespread yield curve inversion, particularly though not exclusively on safe assets. To (mis)quote a famous pink blog, this is nuts, but everyone is pretending there will be no crash.
Here, for your enjoyment, is an à la carte selection of the most lunatic government yield curves. You can find lots more here.
Exhibit 1: Switzerland