The thing that makes this comic especially dumb is that not only is Spinal Tap a comedy, it's a mockumentary! The members of Spinal Tap are supposed to be really dumb. So the punchline is...ha ha, they are so dumb! How dumb are they? They are so dumb, you could take advantage of them! ha ha!
Here, let's watch the original together:
ahhh, so good.
As you can see, the first two panels of the comic are essentially distilled versions of the dialog in the original. And the second two are Randall putting his smart-alec self in the scene in place of Rob Reiner. Being like "oooh, I totally could have said something funnier there! If you are an engineer you will think it is funny!" But no one gives a fuck because a) your version is not funnier at all, b) even if it is, which it is not, the reason they are famous and you are not is that they didn't just make up one joke, they made the whole fucking movie and they made it brilliantly. Who cares what you think of that. Even Mystery Science Theater, which is of course based entirely on other works, makes hundreds of jokes per movie. Yours on its own is just...petty.
And it's not like people haven't made "this amp goes to eleven" jokes before. Guitar Hero (or Rock Band? i forget) had "this amp goes to eleven" stickers for their plastic guitars. Hell, Wikipedia has a whole damn page dedicated to this joke. So your dumb little contribution to the canon makes a huge difference.
This commenter got to the heart of it well, I think, but this commenter just makes me vomit. Why the hell are you giving Randall credit for putting an umlat on the band's name? It's in their fucking name! That's just being correct! Woo hoo! he didn't spell it wrong! good job! here's a lolipop!
god, can i go home now? is there anything else to say about this shit?