Pinyin "shuo4"

烁 = 乐 + 火 : Sheldon Shrimp (shu) started a fire (火) in the observatory's bathroom (e4) and the cheerleader (乐) is dancing happily around the bright (烁) flickering (烁) fire (火).

硕 = 石 + 页 : There is a large, huge (硕) rock (石) blocking observatory's bathroom (o4). Sheldon Shrimp (shu) tries to clear it off by wrapping it in a huge (硕) sheet of paper (页) because he heard "paper beats rock". Of course it doesn't work because Sheldon is not a learned person (硕士).

朔 = 屰 + 月 : The moon (月) wants to use the bathtub in the observatory's bathroom (o4), but Sheldon Shrimp (shu) has been using it all day and it doesn't seem like he'll finish any time soon. The moon angrily tells Sheldon to get out, but Sheldon disobeys (屰). Finally the moon remembers that it is the first day of the lunar month (朔), so he causes a spring tide (朔) which washes Sheldon out of the bathtub (and out of the bathroom) so that the moon can finally take a bath.

欶 = 束 + 欠 : Mnemonic symbol: a drinking bottle, one of those where you have to suck to drink. Sheldon Shrimp (shu) finds a drinking bottle (欶) in the observatory's bathroom (o4) over a bundle of firewood (束). There is a small fire to keep the bottle's content warm. Sheldon doesn't hesitate, grabs the bottle and empties it, sucking (欶) and drinking (欶) the warm beverage. He carelessly throws an IOU note (欠) towards the bundle of firewood, but it almost instantly touches the fire and burns to ashes.