Heathrow to Dublin about 20 years ago now.
I was visiting friends and heading back home so took the tube as the nearest station was just one street away. I'd done the same trip about half a dozen times before without a hitch so figured I was grand this time too.
Only, the tube was the slowest bastard of a journey I have ever taken. Stopped at every station and stood there for nearly 10 minutes with nobody getting on or off. About 2-3 stops from Heathrow, it stopped and the driver got out and fucked off and stayed fucked off for about 20 minutes.
Eventually reached the airport and went to check in. The person at the desk said "Computer says No." and went to close her desk. The woman working at the next desk said "Don't mind her, I'll check you in." Looked up my flight and said "You'll have to take both your bags as hand luggage ( a small ruckack and a large holdall) and you might want to run." So I did.
I pelted it the whole way, including barging my way along the travelator and reached the gate with nobody present but the flight attendants. One gave me a dirty look and said "We called your name" I said that I had been running the whole way and not heard anything.
So, she took my boarding card and went "Oh, you're not John Smith." She then checked the list and, thankfully, I had manged to get checked in with enough time for it to show up on the manifest. Just as she was letting me through "John Smith" appeared having also legged it as he said he was following in my wake.