Who said "I've got a good head on my shoulders."?

This quote is attributed to Cosmo Kramer.

I've got a good head on my shoulders. - Cosmo Kramer

"I've got a good head on my shoulders."

Cosmo Kramer Strength

"Giddy up!"

"These pretzels are making me thirsty."

"I'm out there Jerry, and I'm loving every minute of it."

"It's not a lie if you believe it."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."