正式投票

正 = 一 + 止 : Mnemonic symbol: a stick-figure with straight lines. James II of England (zh) really has to use the engine's bathroom ((e)ng4), but there's a stick-figure (正) blocking the stalls with a barrier (止). The stick-figure measures with a flute (一) whether James is tall enough to go. James stands very straight (正) to make himself as tall as possible.

式 = 工 + 弋 : I'll use a specific style as mnemonic symbol: 哥特式, gothic.

Sherlock Holmes and the goth are celebrating a Viking festival in the space station's bathroom. They don't have trunks to throw around, so they use a steel beam. They also celebrate by practising archery. In zero gravity it is easy for them to set one world record after the next.

投 = 扌 + 殳 : Tecumseh (t) is exerting an ancient sport of his tribe in the outhouse's kitchen (ou2). He is hurling (投) a halberd (殳) as far as he can using a toy claw (扌).

票 = 示 + 覀 : Pocahontas (pi) urgently needs to use the aorta's bathroom (ao4). In the bathroom there is a cleaning lady next to a guidon (示) on which it is written that you have to purchase a ticket (票) if you want to use the bathroom. To make sure that everyone is willing to pay the lady equipped herself with a knuckleduster (覀).