Wei Sheng (legendary character who waited for his love under a bridge until he was drowned in the surging waters) / sb who keeps to their word no matter what
tail / remainder / remnant / extremity / sixth of the 28 constellations / classifier for fish
尾
=
尸
+
毛
:
Willy Walrus (w) knows that there is a ghost (尸) in the Eiffel Tower (ei3), but he cannot see it, so he set up a trap: he put a lot of sticky hair (毛) everywhere, and eventually the hair stuck to the ghost's tail (尾). Now that Willy Walrus can see where the ghost is he is able to drive it out.