I got my jump shot under a main road on a rainy Saturday night :)
Thanks to Al (@brizmako), Ollie, and Sheridan (@shezza), I finally got the jumping selfie. This is a single exposure, Ollie did the light painting on the floor and Al manually triggered the flash on the count of 3.
Unfortunately I'm way too old for this, and it was wet and muddy and stupidly dark in there. I slipped the first time, which was not-much-fun. Then we had trouble with the light at the end of the tunnel swamping the flashed shot, then we discovered obscene graffiti and had to re-frame a bit, but it all came together for this one.