But Hong Leong says the notes were actually tied to undisclosed, much riskier investments, such as two troubled Icelandic banks.

BBC: Morgan Stanley sued over a product 'designed to fail'

The second set was Citi's creation of a trust, called Yosemite, which issued notes to sophisticated investors, tied to Enron's creditworthiness.

ECONOMIST: Citigroup and J.P. Morgan Chase

Notes: Toronto and Buffalo are tied for the NHL's youngest roster with an average age of 26.9 years of age.

WSJ: Tavares and Isles beat Leafs 5-3

The suit says that the notes were marketed as a synthetic CDO that was tied to the performance of major companies and sovereign nations with high credit ratings.

BBC: Morgan Stanley sued over a product 'designed to fail'

In 1921 the Irish Free State won its independence from Great Britain and introduced its own coins and notes in 1928, although the Irish pound remained tied to sterling until 1979.

BBC: Coining a new Europe

Still, as SeaWorld notes in its SEC filings, much of its business is tied to living creatures.

FORBES: SeaWorld's $100M IPO Makes A Splash. But Would You Invest In Shamu?

She notes that the first quarter is typically when the vast majority of vaccine sales are tied to actual flu infections, as opposed to sales bolstered by government stockpiling.

FORBES: The Flu Season Is A Shot In The Arm For Vaccine Makers?