How to stop the CAR to start?

my roommates alaways use my car,how can I stop my car to start to not let him use but easily let myself to recover and start?

for example:

1) can I simply unplug the spark plug ?

2) is there any dangers for start the car without spark plug?

3) is there any adjustment after plug the spark plug back?

thanks!

my roommates alaways use my car,how can I stop my car to start to not let him use but easily let myself to recover and start?

for example:

1) can I simply unplug the spark plug ?

2) is there any dangers for start the car without spark plug?

3) is there any adjustment after plug the spark plug back?

thanks!

How does he start your car ? Does he has your key ?

How does he start your car ? Does he has your key ?

he doesn't has my key but ask me to drive him everytime.

Talk about a lame thread. I'm usually not critical, but this one is ridiculous. And half-brained.

just tell him no catch the bus