Sean Geddes fired Conference North side Worcester City to the biggest upset of the day when he struck twice to knock Coventry out of The Cup.
Hosts Coventry were reduced to 10 men in the 39th minute when goalkeeper Lee Burge was shown a straight red card for violent conduct.
Sunday's results
FA Cup First Round Proper
Sunday 9 November
Winners receive £18,000 from FA Prize Fund
And Geddes made no mistake from the resultant penalty, tucking it away past substitute keeper Ryan Allsop to put Worcester ahead against their neighbours from three divisions above.
And the former Walsall hitman was at it again in the 55th minute, doubling the visitors' advantage with his second of the game at the Ricoh Arena.
Worcester had to hold on tight after Reda Johnson pulled one back for the home side nine minutes from time but it was not enough to stop the FA Cup magic on Sunday.
Meanwhile, 2008 winners Portsmouth had a lucky escape against Conference Premier Aldershot despite taking the lead at Fratton Park.
James Norwood of Forest Green Rovers takes on Marcus Williams of Scunthorpe United
Pompey, who were also runners-up in 2010, went ahead through Jed Wallace's 16th-minute penalty but Jordan Roberts levelled the tie on the stroke of half time.
And Mark Molesley appeared to have won it for the Shots when he scored in the 68th minutes but Danny Hollands snatched a replay with an equaliser nine minutes from time.
Elsewhere, Northern Premier League side Blyth Spartans served up an upset in their all non-League clash with Altrincham of the Conference Premier.
Hosts Spartans took the lead through Robert Dale's early penalty and it got even better when Daniel Maguire made it 2-0 just after the hour-mark.
Robert Ramshaw (R) of Gateshead is congratulated by team-mate Danny Wright after scoring his team's third goal
However, substitute Kyle Perry set up a grandstand finish when he halved the arrears 18 minutes from time – but Dale's second, late in the game, secured Blyth Spartans' progression before Maguire doubled his tally to make it 4-1 two minutes from time.
There was no upset in the clash between Gosport Borough and Colchester United – but there were nine goals as the League One side ran riot against their Conference South opposition.
Gavin Massey started the rout in the 14th minute before Sanchez Watt and then Freddie Sears both struck within half an hour.
Fans turned out in their numbers across the country on Sunday for the First Round Proper ties
Justin Bennett pulled one back six minutes before the break but Alex Gilbey scored in the 45th minute to re-establish the three-goal cushion.
Bennett grabbed a second in the 53rd minute but there was no comeback as a second from Sears and a last-minute goal from Sammie Szmodics made it 6-2 before Lee Wort ended the goalfest in stoppage time for Gosport.
Colchester were not the only side to hit six, however, as Chesterfield won 6-0 at Braintree to cruise into Round Two.
In the day's final game, Notts County and Accrington will go again after playing out a goalless draw at Meadow Lane.
Sunday's results in full
Halifax 1-2 Bradford
Blyth Spartans 4-1 Altrincham
Braintree 0-6 Chesterfield
Coventry 1-2 Worcester City
Forest Green 0-2 Scunthorpe
Gosport Borough 3-6 Colchester
Norton United 0-4 Gateshead
Portsmouth 2-2 Aldershot
Stevenage 0-0 Maidstone United
Wrexham 3-0 Woking
Notts County 0-0 Accrington
