Conversation so far:
When did Unitas start playing with the Colts?
In 1956, Unitas joined the Baltimore Colts of the NFL.
What position did he play?
The Colts signed Unitas, much to the chagrin of the Cleveland Browns, who had hoped to claim the rejected Steeler quarterback.
How did the 1956 season fare?
He threw nine touchdown passes that year, including one in the season finale that started his record 47-game streak.
His 55.6-percent completion mark was a rookie record.
How did he do the following season?
In 1957, his first season as the Colts full-time starter at quarterback, Unitas finished first in the NFL in passing yards (2,550) and touchdown passes (24.

Question: What else happened in the 1957 season?
Self-contained rewrite: What else happened in the 1957 season other than Johnny Unitas finishing first in the NFL in passing yards and touchdown passes?