Actually, I couldn't find very many off the top of my head. Here's the one from my Good Earth tea bag that made me think of looking for annoyingly cheerful quotes:
"A pound of pluck is worth a ton of luck." ~ James GarfieldThis sounded kind of funny-but-painful to me. I guess I do have a mean streak after all...
"Optimism is the cheerful frame of mind that enables a teakettle to sing, though in hot water up to its nose." ~unknownAnd finally, this one might just be plain annoying, since true; for some reason I kept it around in a folder full of old Dilbert clippings. Applicable for both running and writing:
"Never mistake a clear view for a short distance." ~ unknownHave a nice weekend!