A wasp isn't anyone's favorite insect to find flying around in their house, but nobody is going to call 911 if they see one. And when it comes down to wasp vs. tarantula, you'd expect to see the former in the nest of the latter, getting slowly eaten.
But there is a spider wasp called the tarantula hawk that is the boogeyman that small spider children are scared of. To us humans, it looks surreal rather than scary -- like something you'd find in Guillermo del Toro's personal petting zoo.
Seriously, that's Pan's Labyrinth stuff right there.
Of course, there is a reason this kind of bug is called a spider wasp -- its sole mission in life is to transform the world into a never-ending horror movie for its arachnid prey. In this case, the movie is Aliens. The tarantula gets to play the victim; the wasp is the face-hugger. The tarantula hawk will capture, sting and paralyze the tarantula. Then, much as the Alien would, it plants an egg inside the spider's ... ahem, abdomen. Like this:
And, to finish the circle of movie-referencing terror, after growing big and strong on a steady diet of the freaked-out spider's internal organs, the baby tarantula hawk outgrows its home. Yes, this happens exactly as you would expect.