No nuts for my big boys. I stopped giving them almonds several years ago when they just inhaled them whole without bothering to crunch them. I was afraid my mechanical plumbing might be impacted.

Pacu supposedly eat Brazil nuts in the wild. They have very strong powerful jaws.
Listen my pacu crunch a carrot (when he was smaller)
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i do , however, know what you're referring to. Anyone entering my tank will do so at their own risk

I'm sure that those emasculated fellows in New Guinea, or wherever, weren't wearing Speedos.
On another note, my boys are very friendly and like to be petted. Just petted them a day ago. My pacu are very curious and will bite and destroy anything placed in their tank....like air lines.... afterall, they have no hands so only have their mouths to check things out.
That New Guinea pacu probably thought to himself, "Whoa! I didn't know they have Brazil nuts here! Yummo"