In the familiar proverb, it's when "the mice will play"
This is a misuse or adaptation of a familiar proverb to twist or change its ... 
Rhyme (When the cat is away, the mice will play); Ellipsis (Once bitten, twice shy)
... [DOC] [TLE] English proverbs (alphabetically by proverb) - Wikiquote [PAR] Meaning: A group is not stronger than its weakest member.