I bought my house 17 years ago, and moved in on April 1st, 1988. I came home from work on April 9th that year to find what looked like a scene from a Hitchcock movie: hundreds and hundreds of these all over the front of the house, including the front door. I had to get a broom from a neighbor to knock them off so I could go inside. They grew in size and number for a couple of weeks and frequently were found milling about inside the house, uninvited. Thankfully, there hasn't been a bumper crop like that since.