Thats an interesting attempt to belittle the audience, admitting you (the speaker) are a moron. Vw/porsche never hid where they put the engine. It wasnt a secret. Its also not a trunk in rear engine mount vehicle, its an engine compartment.
What it really seems to me is to be the all too often used attempt at “folksy” wisdom, an appeal to what seems to be “common sense” but what is actually the speaker admitting they didnt know something obvious or they think the audiance didnt (and likely did). Its was always irritating. When done well by a professional comedian (see larry the cable guy) its funny. When moron jw speakers try it, its generally trite and zzzz inspiring.
God im glad not to be subjected to that nonsense anymore.