Perhaps it's as good as a rat flail. Maybe we don't fully understand the popularity with hamsters in vietnam. The worst you could do with a hamster is release a male and female hamster into someones house when they don't know.
But, actually a worse thing you can do is find a hole in someones wall, and start shoving as many crickets as you can into that hole to get them good and inside that wall. The crickets will start breeding. The crickets will start making their noises multiplied by how much they breed and mature. It's really annoying, i don't wish it upon anyone, and their so hard to get rid of when someone does this to your house.
This happened to my best friend's house in his parents bedroom. He spent three weeks with a vacuum cleaner looking for all those crickets taking apart the wall panels. Poor dude, then again, he just waited till the crickets started making their noises so he could pinpoint their location and suck'em up.
Vacuum cleaners work great for flies too. They can't resist the vacuum cleaner (doesn't work for bees, they just fly faster and do whatever they can to avoid the vacuum cleaner).