Mark Twain once quipped that reports of his death had been greatly exaggerated. Abe Vigoda, for one, can relate to that sentiment.

The former "Barney Miller" star (not to mention "The Godfather") has shown good humor in turning premature reports of his death into a running gag over the years.

Take, for instance, the 2010 Snickers ad starring Vigoda and Betty White. In the ad, a hungry pickup football player is portrayed by the former "Golden Girls" actress because he was "playing like Betty White." The sight of the ageless White being driven to the turf left many a viewer howling in laughter.

The kicker was at the very end, however, when Vigoda got into the bit.

During the commercial's Super Bowl XLIV debut, one refrain was heard in living rooms across America. Say it with us now: "I didn't know he was still alive!"

With that phrase in mind, lets take a quick look at five celebrities who, like Vigoda, we simply didn't realize were still with us.

Phyllis Diller

Phyllis Diller is still alive?

That may seem unbelievable, especially since Diller seemed to be old and cranky when she was a TV staple in the '60s and '70s.

But that was her schtick, playing the harried housewife with a loser husband, ungrateful kids and always too much laundry to iron.

But what has she done for us lately?

How about playing an old flame of Denny's (William Shatner) in a 2007 episode of "Boston Legal"? They apparently had a romantic moment in a foxhole during World War II. Captain Kirk and Phyllis? Beam me to another planet.

Diller is also the current voice of Peter Griffin's mother, Thelma, on "Family Guy." Thelma is known for chain smoking and gambling, and even had a short June-December relationship with TV anchor Tom Tucker. Sounds like primo voice work, if you can get it. Diller did.

Phyllis Ada Driver. She was born on July 17, 1917, in Lima, Ohio, and she's still with us. Right now she's 94 years old, living in Brentwood, Calif.

Jack Klugman 2008 file photo

Jack Klugman is still alive.

Some of you may know him as Quincy, M.E. (a late-'70s TV series ahead of its time considering all the CSI's and clones on the airwaves these days), but Mr. Klugman most-famously played the lovable Oscar Madison in the TV sitcom "The Odd Couple."

Tony Randall (who is not with us), played his neat-freak foil, Felix Unger. Both were perfect for their parts, made famous in the movies by Jack Lemmon (Felix) and Walter Matthau (Oscar).

While some may argue Klugman didn't have the acting chops of Matthau, he did play the convincing slob/sportswriter. When they showed shots of his sandwich-under-the-pillow-laundry-everywhere bedroom, you always wondered how many people said to themselves, "He lives like me."

In the '80s, Klugman was diagnosed with throat cancer, which left his great voice harsh and raspy. Oscar loved his cigarettes and cigars. Quincy would have told him to quit smoking.

Jack Klugman. He was born on April 27, 1922, in Philadelphia, and he's still with us. Right now he's 89 years old.

Al Molinaro, Happy Days

Al Molinaro is still with us.

Who is Al Molinaro? Didn't you ever watch "Happy Days"? Al owned Arnold's Drive-In, where Richie Cunningham (Ron Howard), Potsie Weber (Anson Williams), Arthur Fonzarelli (Henry Winkler) and the gang hung out.

OK, Mr. Molinaro wasn't the first Al to push milkshakes in the series. Can you guess the first? Tick. Tick. Tick.