Add the shells to a baking sheet, and then let them bake for about 6 minutes.
Add the beef to a skillet over medium-high heat, let it cook for about 7 minutes, and then drain it.
Add the water and seasoning, and then let the mixture cook for about 5 minutes.
Divide the lettuce, beef mixture, tomatoes, and cheese between the shells.
Add the sour cream to a piping bag, and then add 2 dots to 10 of the olives.
Slice the remaining olives into eighths, and then add all of the olives to the tacos.
Notes
You can use the prongs of a fork to apply the sour cream instead of a piping bag! Add these spiders to any of your favorite taco recipes for a spooky surprise.