Mantrap (snare)

Okay, imagine you're playing a game and you want to catch something really fast, like a butterfly. But the butterfly is too quick and always flies away when you get close. So you decide to make a special trap to catch it.

This is kind of like what a mantrap is, but for catching people instead of butterflies. When someone wants to go into a really secure area, like a bank or a government building, they have to go through a special kind of door that has two doors next to each other. The person goes through the first door, but the second door won't open unless the first one is completely closed.

Now here's the tricky part: sometimes bad people might try to sneak in behind someone who's allowed to go through the first door, like a janitor or a delivery person. But if they try to do this in a mantrap, they'll get stuck between the two doors. They can't go back and they can't go forward, and they'll have to wait there until the security people come to check out what's going on.

So a mantrap is like a special kind of two-door trap that catches people who aren't supposed to be in a really important place. It's kind of like a butterfly net, but for grown-up sneaky people instead!