Video previews: http://abcnews.go.com/2020

"THE CAMERA NEVER LIES," ON "20/20," FRIDAY, MAY 25 ON ABC

Behind every great video, there is a great story - and "20/20" has the tales behind the tapes. Anchored by Chris Cuomo, "The Camera Never Lies" airs on "20/20," FRIDAY, MAY 25 (10:00-11:00 p.m., ET) on the ABC Television Network (Rebroadcasts. OADs: 6/15/11 & 11/11/11).

Reports include:

Good Samaritan: Travis Forbes claimed to be the last person to help Kenia Monge as she drunkenly stumbled away from a downtown nightclub. But his story unraveled when surveillance cameras show him wheeling a sealed cooler into his workplace, putting on latex gloves, and turning off the security system. And still it would take another terrifying attack months later before detectives could lock him away for good. Chris Cuomo reports

Toxic Neighbors: They say good fences make good neighbors. But what about video cameras and the internet? They are increasingly playing a role in neighborhood feuds. The results range from ridiculous bickering to high drama, all caught on camera and posted on the internet. But cameras can also document serious misbehavior, even neighbor-on-neighbor crimes. Jim Avila reports on this eye-opening trend.

Pets: Not all "criminals" are human... meet some of the animal species who have had their mischievous acts caught on tape!

Store Clerks Fighting Back: Internet video sites are loaded with surveillance camera scenes of armed robberies caught in the act. Some of those videos show clerks and even customers fighting back against the bad guys. It's a story line as old as cops & robbers and everyone loves a hero. But what are the real consequences when victims attack? Deborah Roberts digs into the aftermath of two dramatic and violent armed robberies.

David Sloan is executive producer of "20/20."