What's the name for when you can't remember specific words?

Confusedus while watching The Vow: "Mother Nature must hate Channing Tater(Tatum) characters."

I'm not crazy.
Only crazy people say this.

Coupon.
Is it Q-pon or Koo-pon?

Is it ironic that "Too many times" is a cliche? -Confusedus

Fatigue heightens creativity.

The corniest joke ever.

What's yellow and grows in a field?
Corn.