The inner eye does not see upon command.

Divination is turning out to be much more trouble than I could have foreseen, never having studied the subject myself.

From now on, I don't care if my tea leaves spell 'Die, Ron, Die,' I'm chucking them in the bin where they belong.

I've got two neptunes here," said Harry after a while, frowning down at his piece of parchment, "that can't be right, can it?"
"Aaaaah," said Ron, imitating Professor Trelawney's mystical whisper, "when two neptunes appear in the sky, it is a sure sign that a midget in glasses is being born, Harry..."
Seamus and Dean, who were working nearby, sniggered loudly, though not loud enough to mask the excited squeals from Lavender Brown- "Oh Professor, look! I think I might've gotten an unexpected planet! Oooh, which one's that, Professor?"
"It is Uranus, my dear," said Professor Trelawney, peering down at the chart.
"Can I get a look at Uranus too, Lavender?" said Ron.

Right, you've got a crooked sort of cross..." He consulted Unfogging the Future. "That means you're going to have 'trials and suffering' — sorry about that — but there's a thing that could be the sun... hang on... that means 'great happiness'... so you're going to suffer but be very happy..."

"You need your Inner Eye tested, if you ask me," said Ron, and they both had to stifle their laughs as Professor Trelawney gazed in their direction.

Yeah,” said Harry. “No more pretending we care what happens when Jupiter and Uranus get too friendly . . .”
“And from now on, I don’t care if my tea leaves spell die, Ron, die — I’m just chucking them in the bin where they belong.