You know what tickles my fancy? This: when the vastly underappreciated etymological relationship between nouns is revisited in their adjectivisation. You forget that "parable" and "parabola" suckled at the same teat (or adjacent teats), until you come across "parabolic". Likewise "genus" and "genre" with "generic". Speaking of parables, one of my all time favourite noun-to-adjective thingies is "fable" to "fabulous". Truly, all other pleasures pale.