The dress code at Toad’s Place Wednesday night consisted of foam-appropriate clothes: tank tops, bikini tops, and no tops. It was Toad’s semiannual “Dance Floor Foam Party,” and hundreds of Yalies showed up revel in the suds.

Dancers skirted the palpating mound of bubbles that frothed out of the club’s foam machine. An enthusiastic few threw themselves lustily into it. Party-goers came away soaked.

“I have every disease, ever,” concluded Bay Gross, ’13, referring to the mysterious make-up of the ubiquitous liquid.

Some sorority sisters went straight to the event from their chapter meetings. Other students popped over to the dance for a study break before returning to the library. The event, presented by the Yale College Council, occurs once in the fall and once in the spring.