Who said "I'm working on myself."?

This quote is attributed to Cosmo Kramer.

I'm working on myself. - Cosmo Kramer

"I'm working on myself."

Cosmo Kramer

"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."