Nico knew one thing he was mildly afraid of.
Tartarus? Creepy, but he knew the way out.
Fish? Gross, smelly, and harmless.
Uncle Zeus? He had his Father who had the looming threat of being on Uncle P's good side so they could topple his throne...
Spiders? No, that was Annabeth's thing, personally he liked them. Sure little mongrels they were.
Heights? Nah, he had to practically live (Ha, Son of Hades. Sorta, walking zombie instead of live) on a flying airship miles in the sky for awhile so any chance of that was gone.
But this...
Nico was just calmly walking to his cabin, thinking of making a skeleton goose, just to see how it would turn out.
He walked into his cabin, threw a baby moose skull into a basketball net and as he looked down at his floor, screamed like a banshee, scrambling on top of his bed masts and cursing to high Olympus.
His carpet was a fluffy, cute, light pink.
He hated pink with a passion, and had a mild fear of being blinded by it.
After Thalia had removed the carpet with many lightning strikes and the cooperation of his mice, with Percy calming him down, they concocted a plan of revenge.
Connor and Travis woke up the next morning to a human skull on their bedsides with 'Seven days...' carved into it with a knife.
The twins couldn't sleep for three weeks thanks to Rodney's 'little donation'.
Oh, and the next day, Percy, Thalia and Nico, were found walking around camp brutally mirdering Barbie dolls in creative and gruesome ways.