I think about KRAKATOA every time I see SOH-CAH-TOA, that thing from Math Class. Ironically, I can't remember-- wait, no, never mind. Sin=Opp/Hyp., Cos=Adj/Hyp., Tan=Opp./Adj.
SOH, CAH, TOAAAAA
((cacophonous caldera sends incandescence cascading skyward))