焊
=
火
+
旱
:
The marmot (旱) is considering to move in with Hamlet (h) and visits him in the anthill's bathroom (an4). To welcome the marmot, Hamlet is welding (焊) a steel sculpture displaying the words "to pee or not to pee!". The sparks caused by the welding set the whole anthill on fire (火) though and so the marmot runs back to its burrow.
工
=
二
+
丨
:
Mnemonic symbol: a steel beam, since 工 looks like the cross section of a steel beam. In front of the engine ((e)ng1), Gitta Giraffe (gu) is doing some hard work: She's stacking a capacitor (二) on a dinosaur bone (丨) on a capacitor (二). She's not very successful, but then she gets the idea to use steel beams (工) as support.