Yeah, I had that problem, too. I had to keep turning it down, then back up. It took me a little while to get past that. Its all very silly but I'm enjoying it. The audience and music are quite distracting though.
But part 4 when Malfoy shows up (around 4:50 in the vid) and he's talking bs about going to some special school and sort of rolling on the floor and bench . . . its like wtf? But in a good way. lol
And vid 5 cracked me up, with voldemort's head attached to quirrel's body . . . their conversation just amused the hell out of me. XD