A Philosophy professor decides to hold an impromptu test for his students, he places a chair on the desk and says "Prove that this chair does not exist, you have 1 hour", One student umms and aahhs for a few minutes writes 2 words on a piece of paper and walks out, the rest of the students are there for the full hour writing pages and pages.
A week later the results are posted on the notice board, the student who walked out after 10 minutes got an A.... What did he write?
Of course it'll fit; you just need a bigger hammer.