Wet Paper Towel Brain

When your brain is incapable of absorbing knowledge/Repeating already known knowledge

Teacher: What is the answer to number 1?

Student: Uhh...

Teacher: We learnt this last month and I made sure you understood. How do you not know this?

Student :Sorry, I have Wet Paper Towel Brain today just give me minute.

Teacher: Ok we'll come back to you later.