Ranma's Tears

Ranma no namida (乱馬の涙) is the 300th chapter of the manga. It is also the first and only chapter of the Ranma's Tears Arc.

Ranma is awoken by Happosai throwing water on him causing him to change into his female form. After Ranma chases him off, he watches Happosai drink a strange concoction. Happosai shouts out that it's a youth potion, but after drinking it nothing happens. Happy re-reads the directions and realizes he forgot the most important ingredient- the tears of a beast who is both male and female, in other words Ranma's tears. Happy sets out to steal Ranma's tears by throwing onions in his face, tear gassing him, and trying to make him eat wasabi. When he finally does get a bucket full of Ranma's tears by hitting a pressure point, he accidentally drops it. Everyone feels guilty since Happosai is so sick, so they mop it up for him, but tell him quite a bit of soy sauce got mixed in from the dirty rags they soaked it up with. Happosai refuses to drink the concoction, but Ranma forces him to drink it. The potion doesn't quite work out, and simply makes Happosai act like a baby instead of actually regain his youth.