Ever tried to start MAMP and have nothing but issues with it saying "can't start mysql" or "can't start apache"
Or this error:
InnoDB: Unable to lock ./ibdata1, error: 35
Or all errors relating to you not being able to work on the site you've just spent the last week working on etc
Something that i've found works 99% of the time is this:
Open terminal and paste this:
sudo killall -9 httpd
sudo killall -9 mysqld
Then you should be all good to start your MAMP server again!