Unsure about the coolest but my 10 year old self saw a barracuda years ago and that has forever scarred me lol! I swam right back to the boat and sat on the edge looking down ready to jump back up at any moment I’ll never forget the way it looked at me with its giant eyes and massively scary teeth. The beginning of finding Nemo is real and even scarier in person guys! Ironically I’m now dive certified but those things still scare the well you know out of me that and large sharks.
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