Scotch tape, generic here, though obviously of proprietary ancient Hibernian origin.
saran wrap, hershey bar, vise-grips, kleenex, band-aid, xerox, photoshop, aspirin, dumpster, weedwhacker, crockpot, thermos, q-tip......
Though Stuart has meandered OT with illogical non-proprietaries, I won't stoop to that level myself by bringing up cramps, banjos, wireless sets (containing wires), or at least I'll claim not to...

Stuart, you must also hate the generality of the term "bulbous" even in your fair land.
