Sarcasm definitely is not the lowest form of wit, although it was said (I forget by whom) that it's a blunt instrument, where irony is a rapier.  There's a very fine line between the two but, like many things, the vernacular use of irony is completely different from the original definition.

I have a theory about the roots of humour but it'd take the thread even more off target so I'll leave it for another time. 

Coppula eam se non posit acceptera jocularum.

My Store

My Gallery