The suspicion that the unreliability of England's batting would be their biggest obstacle when it comes to regaining the Ashes was confirmed on a baking morning at the home of cricket.
Captain Joe Root won the toss and chose to bat, only to see his team crumble in the face of Ireland bowling that was nagging and accurate but far from devastating.
Yes, there was a hint of movement, but nothing exaggerated. Still, England were tentative, hard-handed, without patience and too often deceived.
Roy pushed at Murtagh to be caught at first slip and opening partner Rory Burns closed the face on a drive off the same bowler to be caught behind.
In between, debutant Mark Adair nipped one back to trap Denly lbw and, after Root played all round one from the same bowler to also be leg before, Murtagh ripped through the middle order.
An agitated Jonny Bairstow played an inexplicably expansive drive to be bowled through the gate, Chris Woakes was lbw to one shaving the bails and Moeen Ali feathered a timid prod behind.
At one stage Murtagh, rarely topping 75mph, sent down 11 deliveries that yielded four wickets for only one run.
England had capitulated from 36-1 to 43-7 and if it had not been for the shots of Curran and Stone, the scorecard would have been even more shambolic.
Former England captain Michael Vaughan on BBC Test Match Special: "This is an embarrassment. No other word can describe what we've seen.
"We've seen this so often by England when the ball moves around.
"My wife is Irish. She's been trying to ring me for half an hour now but I'm not answering and it's staying that way."
Former England batsman Alastair Cook on TMS: "I have no idea what is going on. When you face bowling at 75mph that moves, you still want to go at it because it's slow.
"But you need to have the skill to play it later, under your eyes."
Ireland bowler Tim Murtagh on Sky Sports: "I'm not quite sure what's happened in the last two hours. It's a dream just to play here in the first place. But to get on the honours board....
"It's a fantastic first session for us. I didn't think I'd be on the away honours board when I first started playing, but I'll take it. I'm over the moon."
TMS commentator Michael McNamee: "This is surely up there with Ireland's finest moments in cricket. They are embarrassing the hosts at Lord's."
Matthew Staines: That is a truly pathetic performance. Absolutely no mettle, no patience, no application. It's a Test match and England have utterly failed the test... again.
Anonymous: Any tips on how to explain this to two children whose last England experience was seeing them win the World Cup on TV?
Tom, Bolton: That was first degree Murtagh...
Mithun, London: Can Tim Murtagh qualify for England?
Laura, Swindon: Obviously a deliberate ploy by England to lull Aussies into a false sense of security ahead of the Ashes.
Stuart F: I have tickets for day 3 of the Ashes Test at Lords. Seriously checking out the refund policy because I can't see that match getting to day 3 on this showing!!!
John: Any chance Sir Alastair Cook has his kit in the car?
One fan even had some fun on Wikipedia...