Mosquito coils are only for mosquitoes!

Man, the other day I left my window open for just a couple of hours,
and by lunch time, there was one damned mosquito biting me like crazy.

Today I wanted to leave the window to my bedroom open again, so I did,
but I also left a mosquito coil burning. After a while, when I came
back in to my bedroom, there was a giantic hornet hovering in my room!

Somebody should invent an all-insect repellent coil.