Haha! I'm so glad I'm not the only one who plugs their ears and either hums or sings "lalalalala!" while it happens. Fortunately, the only v*ing that I experience semi-regularly is done by cats or dogs in my house... but still, I have to plug my ears until its over.
One funny experience: Once, while riding the bus to my middle school, a girl a few seats in front of me said she felt sick. I had headphones so I turned them all the way up and hoped that we'd make it to school before she was ill. Unfortunately, we didn't make it. I saw her dry heave a few times and knew that it was going to happen. Sure enough, she v*d all over the back of the bus. The stupid/funny part is... everyone but me moved to the front of the bus for the remainder of the ride. I didn't. I sat there, frozen in fear, because I absolutely could not get myself to step over the v*. When we finally got to school 20 minutes later, the bus driver had to open the emergency door at the back of the bus so that I could get out!