It happens to me all the time too. Pisses me off. If it is another nice car doing the buddy system as someone else mentioned, it's not too bad. BUT when I park over the river and through the hills and find the perfect spot, close to a curb or first spot next to zebra stripes so I can leave as much room as possible why the F does the person parking next to me have to come over the line into my space. How hard is it to park in the middle of the freakin lines.