He must like lunch: From an e-mail just now, regarding a "brown-bag lunch" (means lunch in a classroom with a speaker) we're invited to as part of one of my classes... "Students - Prof. XXXXX will be inviting 2 students to join him... for another lunch after the brown-bag lunch on Friday... If more than 2 students are interested, a lottery will be held. Thanks."

It makes perfect sense, I guess, for the professor to be having lunch with the speaker after the talk. But it just sounds funny to say "another lunch."