The last time this happened was in 1936 when the German journalist Carl von Ossietzky was not allowed to leave Germany. The other occasions when this almost happened was in 1975 (with Andrei Sakharov of USSR), 1983 (Lech Walesa of Poland), and 1991 (Aung San Suu Kyi). It's quite likely to happen this year. What?
[+ Show Answer]
That no one turns up to accept the Nobel Prize for Peace. In 1975 and 1983, the respective wives of the winners went, while Aung San Suu Kyi's son accepted it on her behalf. This time, both Liu Xiaobo and his wife are under restrictions and it isn't clear if someone will be able to represent him.