forehead / horizontal tablet or inscribed board / specified number or amount
额
=
客
+
页
:
Albert Einstein (Ø) and his guest (客) are playing a game of 20 questions just inside the elevator's kitchen (e2). They both have sheets of paper (页) fixed to their foreheads (额) with a name on each to guess.
外
=
夕
+
卜
:
There's a hole in the wall of the airplane's bathroom (ai4), and from outside (外), a bat (夕) wants to enter. Willy Walrus (w) is very afraid of bats, so he does his best to hinder the bat from entering with a voodoo staff (卜).