When you say 'jackpot,' would you normally refer to it as
- something that you should be happy about, or
- something that you can very highly unlikely obtain?
I find this use of 'jackpot' hard to understand in the following. (If 'I' said it with reference to (2), it might very well let Jack down ....) (I'm a non-native speaker. If you would explain it in some plain English, I would very much appreciate it.)
"I went to have chemo yesterday morning, and they did some blood work, and I have some numbers that aren't good," he said. "They have to be higher for me to be able to start chemo again."
"What does it mean?" I said.
"Nothing good," he said.
"Does it mean they can't try anymore?" I said.
"There's this shot can give me," he said. "Sort of a booster shot for my blood. If it works it can get the numbers high enough for me to have chemo again."
"Boy," I said. "Did you ever think we'd be talking about getting a booster shot for something like this?"
"I know," he said. "And if it works, the good news—the good news—is that I get to have chemotherapy. That's the payoff."
"Some jackpot," I said.
"You know," he said, "it's getting so that I don't even like it when people say 'What's going on?'. I find myself saying,'Oh, my pulse is down,' or, 'Well, I need a booster shot.'"
('And You Know You Should Be Glad' by Bob Greene)