I really like to study some of the more obscure ones. You get to find stuff like this:
"The voiceless glottal fricative (/h/) is normally written as h, but appears as x after the consonants s, z, and digraphs ending in h to avoid phonological ambiguity. The voiced velar fricative is written as y before i and e (where it is palatalized /ʝ/), as w before o (where it is labialized /ɣʷ/), and as gh before a."
I mean really, when you hear "voiced velar fricative", don't you just get hot?