I don't know how anyone was confused here. I could think of a million examples.
Best feeling - speeding down the road on my motorbike, just me and the road
Worst feeling - the sound of the cop car's siren right behind me
or how's this one
Best feeling - making passionate love with your girlfriend
Worst feeling - her husband walking in on you
For the record, neither combination has actually happened. Although my GF's brother did walk in on us one time...