Why was clemency trending last week?
bet you; I will bet you
representing casual pronunciation of bet you, attested by 1904.
Bet you: I'll betcha I can jump higher (1922+)
What follows is much better than what you have had before: put her mouth lightly against mine and said ''You ain't seen nothing yet''
[1920s+; this was a catch-line of the singer and comedian Al Jolson, and the first words in his 1927 movie The Jazz Singer]