Flashing Objects

Everybody’s seen the flashing objects…effects…where the objects flash from white to…ohhhhhhhh, they’re suddenly there.

How do I do that…
or is it as simple as putting up a white layer…and showing it from one frame and then taking it away.

You’ll have to excuse the smell of newbie.
I’m drenched in it.

Can you post an example… I guess everyone but me has seen it. :wink: