David Lee Roth crashes a party. But do they even know?

Do they or don't they? Do these bachelor party bros actually realize that this is David Lee Roth? The same guy providing the soundtrack to their party? DLR seems to think he pulled off a funny move but I'm not so sure they get it. He proclaims "Happy Neighbor" knocking at their hotel door but I'm thinking they're wondering why this nattily dressed bald guy with a headset mic is coming to their door unless it's to complain about the loud music. If they didn't know, they probably do by now!