Hey, Aqua!
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I shared that very meme with our group a little while back.
(Basically, fireball is a BIG damn spell. It sets EVERYthing on fire. Everything. It's basically a magical IED. So the classic blunder is for an inexperienced wizard or sorcerer to cast that shit in a too-small space and set their party on fire.)
I'm a fire sorcerer in our group. (Read: not a wizard.)
My wife's a cleric.