Off topic, sorry. I sold a Mk IV Cortina outside of Rock Ferry car auctions late one night, late 80's. I had my ex wife and daughter with me. We had no way to get home, so I bid on a bright yellow FSO. It was like an early Lada, but even boxier. Got it for about thirty quid. Thankfully it drove OK and got us to the mersey tunnel. It had a pull out choke, but next to it was a mystery pull out thing.
In the tunnel my curiosity got the better of me, I just had to know what it was, so pulled the mystery knob out as far as it would go. It was a hand throttle (as I discovered later). The revs screamed, and the car accelerated, I was so worried about hitting the tunnel walls that I didn't even think to shove it back. Was like some really crap video game as we hurtled through the tunnel with my foot off the accelerator panicking and looking puzzled!