Variations on Le Mur

I use Audacity for editing audio, but after 15 years still know very little beyond the basics.  Apparently, there's this thing where you can lock it in continuous "play", and play back forward and reverse by scooting the cursor around. Not even sure it's supposed to happen.

 Here's what it did to Mr F Le Mur's "Andy of Bug Porn #10"

And here is a handy link to more Le Mur.

Update: It's an Audacity feature called "scrubbing" and it's found on Audacity 2.1.3, under "transport".

If your mouse has a scroll wheel, you can speed or slow the playback.  Wild wacky stuff.