This is an Urban Legend which first appeared in the US in 1998 and has recently resurfaced.
The original (1998) hoax message appears below:
IMPORTANT MESSAGE FOR SAFETY-PLEASE TAKE TIME TO READ.
A friend stopped at a pay-at-the-pump gas station to get gas.
Once she filled her gas tank after paying at the pump and
started to leave the attendant inside came over the speaker. He
told her that something happened with her card and that she
needed to come inside to pay.
The lady was confused because the transaction showed complete
and approved. She told him that and was getting ready to leave
but the attendant once again urged her to come in to pay or
else. She proceeded to go inside and started arguing with the
attendant about his threat. He told her to calm down and listen
carefully: He told her that while she was pumping gas, a guy
slipped into the back seat of her car on the other side and he
had called the police. She immediately became scared and looked
out there in time to see her car door open and the guy slip out.
The report is that the new gang initiation thing is to bring
back a woman's body part. One way they are doing this is
crawling under girls/women's cars while they're pumping gas or
at grocery stores in the night time. Then they are cutting the
lady's ankles to disable them in order to kidnap them, kill and
The other way is slipping into unattended cars and kidnapping
the women to kill and dismember them. Please pass this on to
other women, young and old alike. Be extra careful going to and
from your car at night. If at all possible, don't go alone! This
is real!! The message:
1. ALWAYS lock your car doors, even if you're gone for just a
2. Check underneath your car when approaching it for re-entry,
and check in the back before getting in.
3. Always be aware of your surroundings and other individuals in
your general vicinity, particularly at night! Send this to many
girls so your friend will not be the next one.