I am reasonably sure the ticket is not served until it is placed on your windshield. If you get out before they can place it you win.
You might be in luck
"
Ontario Vehicles - Ignore the Parking TicketThe
Provincial Offences Act recognizes that a parking ticket placed on your windshield may not be there when you return to your vehicle. The wind could have blown the parking ticket away or someone could have taken it. If you do not respond to your parking ticket, in other words, you don't request a trial or pay the fine, there is an assumption that you did not get the parking ticket in the first place.
There is no legal way to convict you if you ignore the parking ticket.
This is very different than speeding tickets. If you ignore a speeding ticket, you are considered to have defaulted. They can convict you because there is a default provision under the law. There is no default provision to convict someone for ignoring a parking ticket.
But what if the officer hands you the parking ticket?
There are two ways you can get a parking ticket in Ontario and both are covered under
section 15(4) of the
Provincial Offences Act. First, the officer can "affix" the parking ticket to your vehicle which usually means placing it under the wiper blade of your windshield. Second, the officer can personally serve you the parking ticket (i.e. hand it to you). If you drive away before he places the parking ticket on your vehicle or hands it to you, that parking ticket is invalid.
If you are not that lucky, it doesn't matter whether the parking ticket is handed to you or placed on your windshield. In either case, once you receive the parking ticket
section 17 applies. There is no default mechanism under this section to convict you.
If you ignore your parking ticket
section 18 requires the municipality to mail you a
Notice of Impending Conviction. This notice which you get in the mail does have a default mechanism to convict you if you don't respond. It is this notice that you must deal with, not the parking ticket. You cannot be convicted for ignoring your parking ticket."
http://www.ticketcombat.com/parking/ignoreit.php