Former Playboy Playmate Pamela Anderson, who ranks fourth on our list, is another example.

FORBES: Most Overexposed Celebrities

Meanwhile, Madison claimed Wilkinson's now-husband Hank Baskett was actually into Playmate Kayla Collins.

CNN: Former Playboy girlfriends feud

When one of the orang-utans displayed an open, gaping mouth, its playmate would often display the same expression less than half a second later.

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Elie became one of the most high-profile online poker processors and even married a former Playboy Playmate, Destiny Davis, the day after he was indicted.

FORBES: Jailed Online Poker Payment Processor Sues His Former Lawyer For Malpractice

Controlling for everything else, a child who has been to pre-school is 15 percentage points more likely to be ready for kindergarten than a playmate who has not.

ECONOMIST: Pre-school education in Texas: Start them early | The

Yet behind this reassuring tone lurks a long-held French worry that a united Germany may one day seek to punch its real European weight and no longer treat France as an equal even as its sole playmate.

ECONOMIST: Where is it going? | The

In early April, a 4-year-old boy in Tennessee shot and killed a 48-year-old woman, and just days later, 6-year-old Brandon Holt was killed in New Jersey after being shot in the head by his 4-year-old playmate.

CNN: 5-year-old Kentucky boy fatally shoots 2-year-old sister

The father of the Toms River, New Jersey, boy -- who died earlier this week after being shot by his young playmate -- said he and his wife decided to donate Brandon's organs, in hopes some good will come of their tragedy.

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Despite incidents such as the recent death of a 6-year-old New Jersey boy shot in the head by a 4-year-old playmate, as well as the accidental shooting of a Tennessee sheriff's deputy's wife by a 4-year-old boy, accidental firearms deaths are rare among children.

CNN: Before the play date, the gun talk