I pity the fellow who has to create a dialect or paraphrase the dictionary to get laughs. I can't spell, but I have never stooped to spell cat with a 'k' to get at your funny bone. I love a drink, but I never encouraged drunkenness by harping on its alleged funny side.
Forbear harping on what was of yore, for it is the common lot of mortals to sustain the ups and downs of fortune.
I have really done so few bad things that they have to keep harping on the old ones [. ]
If you keep harping on a disability, then you'll start believing there is one. So I don't.
When opponents keep harping on one point, it is a sure sign of success!