"The last trace of steam evaporated in the autumn air. The train rounded a corner. Harry's hand was still raised in farewell.

"He'll be alright," murmured Ginny.
As Harry looked at her, he lowered his hand and absentmindedly touched the lightening scar on his forehead.
"I know he will."
The scar had not pained Harry for nineteen years. All was well."
~Harry Potter and the Deathly Hallows

The scar had not pained Harry for nineteen years. All was well.
And of course, it had to be at that exact moment when a hot, searing pain exploded in Harry's forehead. If he had reflected on it and compared it to the countless times he'd felt the same pain before, Harry would've found himself thinking that the pain was actually not that bad. However, at that moment, he was too shocked to think anything. In fact, for a few seconds, Harry couldn't quite recognise what the pain was.
"Harry! Are you alright?" Ginny sounded both bewildered and concerned.
"I-" Harry realised that he was covering his scar with his hand, a move so instinctive that nineteen years hadn't removed it from his muscle memory. He turned to Ginny, his face reflecting her bewilderment.
"My scar," he said no louder than a whisper. "It started hurting again."

Kingsley Shacklebolt was on the phone with the muggle prime minister when Harry Potter burst into his office. He knew it was Harry straight away because the Head of the Auror Department was the only one who was respected (and, as he suspected, brave) enough to burst into the Minister's office. Seeing that it was indeed Harry, he signaled him to wait while continuing with his conversation. When he saw that he was followed by the Weasleys and observed the unanimous look of fear on their faces, he dismissed the prime minister, putting down the phone as he turned towards the trio.

Between the three of them, they explained how Harry's scar had started hurting at King's Cross. Then they told him about the near-accident the Potters had had when Harry's scar hurt a second time as he was driving out of the station car park. After that, Ginny went home with Lily and Hugo. The other three apparated as close to the Ministry as they could and ran the rest of the way to his office where they were now standing.

Harry had been relieved when Kingsley seemed to believe them. The other officials, however, had other ideas. They'd been arguing for hours, having only been interrupted by Harry's jolts of pain from his scar, which half the room believed was an act.
"…it's only because Potter is no-longer getting as much attention as he used to!" Harry had zoned back in in the middle of Kirk Buskin's protest. "He's trying to make everyone recognise him as the hero again! That's what this is all about!"
Yeah, Harry thought. The last time they accused me of that, the Ministry was attacked. And Sirius- No, he couldn't think of that now; he couldn't lose his cool when something more important was happening.
"Then why hasn't anything happen yet, huh?" Buskin was now challenging Harry's point which someone else had apparently raised for him. "With all due respect, Harry," Harry was simply too tired to react as the barrister addressed him directly, "but if what you say is true and Voldemort has returned, why hasn't anything happened yet?"
Harry was about to correct him and say that he didn't think that anything was necessarily going to happen when, as if on cue, Teddy burst into the room.
"Harry!"

At first Harry thought that it was strange. For a start no one ever burst into the minister's office; well, no one apart from him, that is. What was stranger yet was that he had drilled into his godson on his first day of Auror apprenticeship that if the other apprentices didn't call him by his first name, Teddy didn't either. However, what Teddy said next was even stranger.
"There was this man in the Ministry. He just- just sort of appeared. It wasn't even as if he apparated. Of course, we checked but the apparation wards were working perfectly. Anyway, this guy, I thought he looked familiar but when he said it, I couldn't believe it! He says he's Sirius Black, Harry. The man who fell through the veil is Sirius Black!"