CSS Humor

.arabic-letters { direction: rtl; }

From Timur

.clean-bathroom {
  > p {
    display: none;
  }
}

From Jeffery Jones

.blackhole {
  background-color: #000000;
  display: flex;
  justify-content: center;
  align-items: center;
  width: ?;
  height: ?;
  padding: 0;
}

From Ricardo Abad

.sasha-grey::after { resize: both; }

From darxide

.usa { border-bottom: 4vh solid gray; }

From Mattis Dettmann

.mexico {
  border-top: 10px solid grey;
}

.unitedstates {
  border-bottom: 10px solid grey;
}

From Kenny

.glasses.lost { filter: blur(1000px); }

From Andrew Ashley

#theillusionist:before {
  color: #008000;
  content: "🌱";
}

#theillusionist:after {
  color: #FFA500;
  content: "🌳";
  zoom: 1600%;
}

From DavidC

#usa .california {
  background-image: url("flag-canada.png");
}

From @ramriot

#trump .federal-taxes { display: none; }

From @Kedxr