if you have Animal Crossing: Wild World for the DS then this is important..........if not then just ignore this------>
Various users have reported receiving glitchy red tulips in the mail after connecting to the Nintendo WFC.
After using wifi, a letter shows up in your mailbox. The title of this letter is garbled characters, and it is usually blank when read. There is a present attached. When you unwrap it, you will find a furniture leaf called "red tulips" inside. However, if you put it in your house, it disappears and cannot be picked up again. You cannot put furniture in the spot where you dropped the glitchy tulip.
However, if you drop the tulip outside, it can be planted anywhere in the town, including the stones in front of your house. If you pick the flower up again after it is planted, it seems to become a normal red tulip again (and will have the properties of a normal red tulip).
I don't know if there are any other negative effects of this tulip, but I recommend deleting the letter or restarting immediately if you've placed the tulip in your house.