"The Screen is Blurry", yeah, I get that a lot.

This happens every now and then, but one time in particular, a middle-aged man kept complaining that it wasn't focused. I asked him if he would like to come up and focus the projector himself. He accepted my offer. After a brief tutorial, he twisted the knobs and said, "that's better". A few more people came out and complained that it was even worse than before. Luckily, I could place the blame on Mr. Know-it-all, who did try to defend himself with the crowd.