Today's real-world specimen of jaw-dropping horror is... well, kinda cute, actually. Not too many people sport big smiling faces on Mondays, so this spider's huge, goofy grin is a little suspect for that reason alone. But the aptly-named happy face spider didn't put on that smile to cheer you up – it's probably there to scare the hell out of potential predators (birds, mostly), who probably see that deranged clown face and do a quick one-eighty.
Native to Hawaii, this spider goes by the scientific name Theridion grallator – which kinda sounds like a rejected Transformers character, and maybe a little too badass a handle for a bug that's smaller than your fingernail. The unique pattern that inspired its name is on top of the abdomen, which is usually yellow in color, but the “face” shape and color can vary.
The species is harmless to humans, so unless a mad scientist shrinks you to about 1/4” high, the only real threat posed by this grinning bug is a potential nightmare about being stalked by a giant murderous clown/spider hybrid.