Having grown with my parents summer house up not far from a few dispersion airstrips it was quite common to have these guys zoom past at treetop level going stupid fast!
Most memorable moment would easily be being out fishing on a long skinny lake when the rumble started on the far side, check over my shoulder had 2 Viggen's heading straight for me well below the treetops! Zoomed past at a height where I could of have counted rivets and the lead didn't bother clearing the treetops as the lake ran out, just put it up on a wing and followed an access road with half a wing sticking down between the trees!