Perhaps the Spurs game...but think largely because a bunch of locals told us "It's a good job your non-league or you would be getting a right hiding".
I think the reason they said that, and I love this soooo much, is that we just did what we always did at matches.. All met up in the pub outside the ground. Which just happened to be the main spurs lads pub that no away fan had dared venture into for many years.
We piled 100 in there, took over the vault, singing like mad and they were completed shocked.
Eventually they found us quite novel and decided not to individually beat us. PNE take note.
IIRC, it was largely because of a chant we had at the time "Cantona eats garlic, Giggs is f***ing queer, We are Alty FC, we're only after beer!" which they found quite chortlesome and made it fairly obvious that we
a) weren't UTd fans looking for trouble
b) were just Alty
c) as Ecky says, clearly just soooo naive that there would have been no fun on battering us.
Also, I believe it was on the BRoadwater Farm estate which as some of the older ones amongst you will know is an unbeliveably infamous area of London. I think they were shocked we were there in the first place never mind anything else.
And to show how naive we were we went into the main Preston firms pub two years later. "You've got 10 minutes to finish your drinks and go" was misinterpreted as 'oh it must be shutting, lasties soon' and some of us preceded to order some halves. This didn't go down too well and needless to say we didn't quite finish them.