changing tyre

I ran over a loose screw somewhere and my left back tyre went flat. I
was
going out to do some groceries shopping tonight when i discovered the
flat.
So i searched for all the tools, jacked up my car and began unscrewing
the
tyre bolts. Only i turned the wrong way (clockwise) and tightened one
bolt
instead of losening it to get out the flat tyre. Later when i tried
to
loosen that bolt it reached a certain point where it wouldn't budge.
So i
leaned my body weight against the spanner and snap! the bolt broke off
with
part of the tyre screw embedded within. Tomorrow i will have to go and
see
the workshop people and ask if they can replace that broken-off tyre
screw.
It's the screw which is actually on the tyre rim thingy, it's part of
the
car. The other 3 screws i have bolted down with the spare tyre and the
car
will run on three screws, but i need to either get a new bolt which
will
only half tighten since part of that screw broke off, or the workshop
guys
can replace the broken off screw with a new screw. i'm hoping it's
the
latter.

changing tyre is a very good lesson in life. It builds character.