My mom discovered that she could get me to stop crying at age 6 months if she dropped my diaper and spanked my bare bottom. I was a very sad and fearful child unable to defend myself at all against anyone. I was so incredibly sensitive to criticism that my dad finally said when I was an adult that I never needed spankings at all.
By the way, 2 year olds are too young to be hit by anything. I am so fiercely against spanking just like Cognac for the exact same reasons.