Ive had that happen.
Even weirder was what happend to me last night. I took the SD card out of my phone and tried to put it back in. Apparently the spring contraption was locked down or something (I do know how to take them in and out), and the SD card just slid right into the belly of the phone.
Now I have an 8gb sd card just chilling in my phone with no way to get it out, and because verizon reps cant open the phone, they are pretty much worthless.