A lot of celebrities stopped by Jimmy Kimmel Live on Tuesday night to kick off the first-ever (RED) SHOPATHON, co-produced by VICE Media, in honor of World AIDS Day. In collaboration with the (RED) Omaze Experience, which gives fans opportunities to meet their favorite stars while raising money for the charity, everyone from James Franco [1] to Snoop Dogg participated, but unfortunately for Matt Damon [2], Jimmy just didn't have enough time for him on the show. The two continued their hilarious feud [3] when they bickered back and forth about how much they despise each other — in the name of charity, of course. See the full video above, and then check out the time Matt got his revenge by kidnapping Jimmy [4] on his show.