In the days before prohibition (worst idea ever btw), a Daisy Cocktail was a refreshing mix of a strong spirit (usually brandy or gin), orange liquer (think Cointreau or Grand Marnier), lemon juice and sugar.

During prohibition, many Californians went to Mexico to do their drinking, and in a time before air-conditioning, they demanded refreshing Daisies. The local bartenders subbed tequila for gin or brandy, and limes for lemons, to create a Mexican Daisy.
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The word for "Daisy" in Spanish? Wait for it...Margarita. True story. And that's how the worst idea ever, gave us the best cocktail ever.
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Best idea ever? Perfect ‘Ritas in cans.