You can use the "Skeletrons Hand" grappling hook as two hooks, but it says it's only one hand.
Making rainbow bricks out of gel.
Flying fish are nowhere to be seen until rain, as well as umbrella slimes being somehow bigger blue slimes with umbrellas.
For some reason, when something to do with the moon happens that doesn't normally happen, new creatures spontaneously appear from thin air and try to kill you.
Monsters don't go after NPCs, only you. (Also, zombies, floating eyes, big floating eyes, giant flying skeleton, vampires, Frankenstein's Monster, etc. exist and try to kill you in many gruesome ways)