Everybody gets stressed out.
Sometimes it's from too much studying, or lack thereof (I'm gonna flunk this test). Other times stress comes from too much working, or lack thereof (How am I gonna pay the rent?).
But sometimes you just gotta dance . . .
At other times, just having a good laugh will clear your head and help you move onto harder subjects, even something like physics, or whatever the professor is teaching in the following video. A cathartic emotional release purges the emotions and relieves emotional tensions, "especially through certain kinds of art, tragedy or music." Both of these videos qualify as art, such as music and, in Zoro's case, even a bit of tragedy.
So take time to laugh and then get back to work with a fresh outlook and you'll find things may just be a little bit easier.
What kind of quick stress relief do you practice to keep your head on straight?