Who said "Let's make the most of it."?

This quote is attributed to Kelso.

Let's make the most of it. - Kelso

"Let's make the most of it."

Kelso

"I'm not stupid, I'm just not thinking."

"That's what I love about these high school girls, man. I get older, they stay the same age."

"I'm a sexy beast."

"My brain is on fire."