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Catering to the whims of the Web 2.0 crowd is tricky — but it usually doesn't bring in firetrucks. The Supernova conference, which wraps up tomorrow, served freshly made sliders, White Castle-style, at a party this evening. The fumes from this fare were enough to alarm San Francisco's fire department, which sent up a ladder crew to investigate. Photos from an eyewitness, after the jump:

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The offending burgers.

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Plaxo's Joseph Smarr and John McCrea deem the sliders Comcastic.

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Here come the firetrucks!

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Ladder at the ready!

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Firemen converge on the culinary disaster.