triggering an event in another C# script

hi, this has probably been asked a million times however i cant seem to get it to work.

I have two scripts. one event occurs in script A and should trigger another in Script B.

if(transform.position.y < 0)
	//trigger in other script B

And then in my other script, B i want something like this:

//if Event happened in script A
	blockcount--;

I’ve looked everywhere for an answer but nothing works, can someone help? would be much appreciated!

Watch this tutorial and it should become clearer.