On this day in 1948, Cubs owner P.K. Wrigley took out an ad in all of Chicago's newspapers apologizing for his terrible team.
The Cubs had gone with a youth movement, and it had utterly failed. Initially the young team appeared sparked by the angry flame their owner lit under their bottoms, winning seven of their next ten games. Unfortunately, they followed that up with a ten game losing streak, and ended the year with 90 losses. At the time, it was the worst record in team history.
Needless to say, it's no longer the worst.