Indeed!, i have two diesels and a petrol,I used to quietly mock those that got them mixed up...till i did it myself a couple of years ago!
The incident made me go a bit overboard with vehicle security,since then i have always had VERY good alarm/immobilisers fitted. Funnily enough,prior to the car getting stolen,i used to be very relaxed with vehicle security, to the point of leaving the keys in the ignition overnight occasionally!

Thankfully, i had fully secured the car before it got pinched, so at least the insurance paid out...