Examples:

• I'm able to reach loads of people at one specific time quickly, at the drop of a hat.
• They can lose their temper at the drop of a hat.
• Faint at the drop of a hat, I do.
• All the women in my family get pregnant at the drop of a hat.
• I get hard at the drop of a hat.
• I just don't bare my soul at the drop of a hat.
• Girls fall in love with you at the drop of a hat.
• And at the drop of a hat, it could all be done.
• Tell me their life stories at the drop of a hat.
• If you are like me, you love to fish at the drop of a hat.