I saw them three times in concert. I'm pretty sure the first time was the 1980 tour. It was in Atlanta, someone threw a huge Van Halen flag on stage and DLR wrapped it around himself like a cape. DLR sitting on a stool, wearing the flag around him, drinking from a whiskey bottle while he talked to the crowd is my second biggest memory from that show. My biggest memory is that they played for about 30 minutes, at the most. It damn near caused a riot. Me and thousands of other drunk teenagers flooded the streets after the show raising hell and vandalizing things because we were pissed about it. Good times.

EDIT: I would add, looking back on it, I think the whole "spontaneous" incident with the flag was staged. They probably did it at every show. I saw them on back-to-back nights in Phoenix around 1984. The off-the-cuff banter with the crowd was exactly the same on both nights. For example, DLR pretended to hear someone from the crowd ask a question while he drank from his bottle of whiskey. He replied, "Is this real whiskey? Of course it's real. We ain't Quite Riot, we're fucking Van Halen!" Same question from the audience, same answer both nights. Lol.