Kevin Lisbie scored a late winner to maintain Leyton Orient's 100% record and their best-ever start to a season with victory against Port Vale.
Vale took the lead through Louis Dodds' stooped header from Tom Pope's cross.
David Mooney smashed in a disputed equaliser for Orient before grabbing his second from close range.
Jennison Myrie-Williams converted Doug Loft's cross to level, later hitting the bar with a free-kick before Lisbie lashed home the winner from 10 yards.
VIEW FROM THE DRESSING ROOM
Leyton Orient manager Russell Slade told BBC London 94.9:
"They never gave up, and that was the beauty of it today. We went a goal down but got ourselves in front, against the run of play.
"For the support to stay behind us when we were one down, and then it was 2-2 to stay with us, everybody's got their rewards.
"You'd rather be in this position than losing six out of six every day of the week. There's no danger about that."
Port Vale manager Mickey Adams told BBC Stoke:
"We're bitterly disappointed with the result, but we can take an awful lot of positives out of the game.
"I didn't want to come here and sit back to try and nick a result.
"We had a positive approach and it looked as though we were going to get something.
"Having said that, some of the goals we've conceded were absolutely criminal."
Leyton Orient 01 Jones 02 Omozusi Booked 05 Cuthbert (Batt - 68' ) 06 Baudry Booked 15 Clarke 04 Vincelot 07 Cox 08 James Booked (Bartley - 74' ) 11 Odubajo 09 Lisbie (Stockley - 90' ) 10 Mooney Substitutes 12 Larkins 14 Batt 16 Lee 20 Gorman 21 Bartley 19 Lasimant 22 Stockley Port Vale 01 Neal 04 Robertson Booked 05 Dickinson Booked 06 Chilvers Booked 24 Duffy 07 Loft 08 Dodds (Williamson - 74' ) 09 Myrie-Williams 21 Griffith 11 Pope Booked 23 Mohamed Substitutes 02 Yates 15 Shuker 18 Lines 26 Birchall 10 Tomlin 19 Williamson 29 Hughes