Mary had a little Firesheep? ITS sent out an e-mail Tuesday morning warning students about a Firefox add-on, Firesheep, that can allow people on open Wi-Fi networks to hack into “insecure websites,” including Facebook and Twitter.

If at first you don’t succeed… Morse and Ezra Stiles Colleges’ are not forgetting the raid that broke up their screw. On a poster for their joint party, Prohibition, they say they are going to “try again.” Prohibition is scheduled for Nov. 6 in the Morse College dining hall.

Our rivals want kegs. Harvard’s Undergraduate Council is trying to get the university and the Boston Police Department to allow kegs at future Harvard-Yale tailgates, the Crimson reported. But the effort comes too late for this year — kegs have already been prohibited.

It’s beginning to look a lot like Christmas? Well, it is on the New Haven Green, at least. According to a press release issued by City Hall Spokeswoman Jessica Mayorga, the city’s Holiday Tree is being cut down in Northford, Conn., and will come to the Green today.

ROTC at Yale? The Yale College Council sent out a survey Tuesday evening asking students’ opinions about bringing the Reserve Officers’ Training Corps back to Yale. The survey asks if students would support ROTC regardless of “Don’t Ask Don’t Tell” being repealed and whether their decision is contingent on that.

Brightly colored skeletons and skulls were displayed on Beinecke Plaza for el Día de Los Muertos on Tuesday. Students from the Yale Mexican Student Organization built an altar for the occasion. One of the skulls read “Levin” and Yale College Dean Mary Miller contributed zempoalxochitl flowers, which are displayed during the holiday.

Provost (and psychology professor) Peter Salovey talked about love during professor Paul Bloom’s popular “Introduction to Psychology” course Tuesday. Salovey’s lecture focused on theories of love and different possible love relationships.

There’s a spa day in your future. There is a sign in the window of the empty storefront in between Davenport College and J. Press on York Street saying that a full-service salon is coming to the space soon.

THIS DAY IN YALE HISTORY

1942 Yale President Charles Seymour announces that Christmas vacation will be an extra week long because of busy transportation and a need to prepare Old Campus for the armed forces set to arrive in January.