SAN FRANCISCO, April 16 — Tony Bennett may have left his heart in San Francisco, but a tourist recently discovered that you can leave your arm there as well. That is, when local fashionistas convince you to stick your arm into a dark and foreboding grotto – a grotto that happens to be occupied by a large and remorseless sea lion, whose insatiable appetite for human flesh is exceeded only by his remarkable capacity to accurately predict the onset of the summer fashion season!

Perpetually shrouded in a thick fog, San Franciscans have for years employed a most unusual method for figuring out if warm, summer weather is in the cards, a time-tested ritual that has drawn comparisons to Punxsutawney Phil, the famous weather-predicting groundhog. Each April, Bay Area designers dupe an unsuspecting visitor to reach into the bone-strewn lair of Frisco Frank, an impossibly ferocious sea lion, and attempt to feed him a crab. If the sea lion takes the crustacean, then chances are the summer swelter will be late. If, however, Frank rips the person’s arm off with his powerful jaws, then – rejoice! – white-pants weather is just around the corner. Indeed, the sight of a horrified tourist stumbling along Fisherman’s Wharf as his or her bloody stump flails in the cool morning breeze means it’s time to start buying the latest summer fashion – like Summerounds horizontal seersucker pants and shorts.

“Clearly, the long, hot summer is upon us,” said Cordarounds founder Chris Lindland, coolly observing Frisco Frank devour tourist Todd Murphy’s left arm. “Time for cold, refreshing beverages and cool, seersucker pants and shorts like these."

This year’s Summerounds come in new colors, with new linen liners and more pucker. They’re stylish and also surprisingly high-tech – reportedly at least 90 degrees cooler than traditional seersucker pants.

Historical note: Few doubt Frisco Frank’s powers of prognostication or sense of style. Legend has it that Levi Strauss, another notable San Francisco pant maker, would con hapless gold prospectors into feeding the sea lion with arms swathed in different fabrics. Frank’s extraordinary appetite for denim inspired Straus to design jeans, particularly in the color blue.