It's an old joke, but it's funny :)

This Saturday, my friend and I decided to visit some friends. We went to a store to buy vodka and juice, and we were already a bit tipsy. I asked the saleswoman, "Is the vodka good, not fake?" And she said, "Go ahead, guys, the vodka is very good; no one has complained yet!" My friend and I burst out laughing... "because no one has complained yet!"

“On the door of the head of the Department of Nuclear Physics: ‘Head of the Department of Nuclear Physics, A.F. Sobakin.’”