Dumkopf!

Gosh! what a bargain...can this be true? Unbelievable value, so versatile too! Lest I should waver, here's cash on the nail... Lo! and hey presto!...this gadget can't fail! Integrity certain, for you I can trust... Burnt fingers...ouch! can't see you for dust! Learnt lesson? um..aa...ja well, and no fine... Ever the sucker...first letter, each line! !