I had one too. I had common sense to not put my finger in one, so does a fly trap react to a finger touching it's leaves?
You have to be careful with "carnivorous" plants like that, since playing with them can be a surefire way to kill them. If they have a trap mechanism, then they're usually rather sensitive. They're not smart at all, it simply waits for something to trigger it and it closes.
Venus Flytraps will close if a hair inside it is touched and within 20 seconds another hair is also touched.
Since they're so small, if you touch it with a finger, you're guaranteed to touch multiple hairs at once.
When that happens, it closes down and locks up for a set amount of time. It'll start to digest and produce enzymes.
It'll take 10 days approx. for it to finish digesting, and then it opens. So, if you close it prematurely a number of times it can waste energy and fail to pick up nutrients, which can cause it to die.
Plus, since they're small and are still only leaves on a plant, it's easy to accidentally break them or damage when you touch.
