Yusuke and Kuwabara in “Unfinished Business”

[perched on the back of Kuwabara's chair] It's a good thing I came over to check on him; he's fallen asleep in the final inning! [gently shaking him] Hey, Kuwabara! Kuwabara! Wake up and study, doofus! Your test is tomorrow! Ah, seems he's out for good...guess I'll have to show up in his dream.

[seeing Yusuke] Urameshi! You've come back for a fight, huh? Well, I'm gonna make cat food out of you!

Hey, whoa whoa whoa whoa! [picking up Kuwabara's textbook] You've gotta pass this test first!

[yanking the book out of Yusuke's hands] Gimme! I was just studying this before you showed up.

Why is the color of blood red?

Because of all the red blood cells! They color it. That's easy.

But what's the pigment?

Hemoglobin! I forgot!

And what causes your blood to clot?

[mumbling in his sleep] Plate...lets...

[nodding] Yes...good, good.