Try talking while thinking about your sad memory and everything around it.

When you do... you'll find one specific spot that immediately hurts your heart to remember. That there's your trigger to call up instant sadness.

In my case...

I think about when my pet parrot Momo-chan died.

I raised up the unmoving Momo-chan in both hands, and thought...

Is he really dead? Is he really not just sleeping?

But, well... Even when I poked his beak with my finger, he didn't playfully nibble on it like he always did.

When I moved my finger, his beak just moved limply along with it...

My personal trigger for sadness is Momo-chan's beak.

When I think about it, the feeling wells right up again, and I can perform the sad scenes...