筛检

筛 = ⺮ + 师 : One time in front of the airplane (ai1) Sherlock Holme's (sh) teacher (师) showed him how to filter (筛) urine into drinkable water using just a bamboo stick (⺮). That one was actually a prank to make Sherlock Holmes drink his own urine.

检 = 佥 + 木 : Joan of Arc (ji) and General 傅佥 (佥) are spending Christmas Eve inside of the anthill (an3). Next to them there is a Christmas tree (木) at the bar. Joan of Arc and the general again and again check (检) and investigate (检) the tree whether there are already some presents under it.