Guido's

not harsh at all, the term "spastic" has only been deemed harsh since and outlawed as an acceptable term due to kids calling it each other as a term of abuse.. very possibly following the Joey Deacon story on Blue Peter.

beautifully circular.

Not only did the sound of kids "deaconing" ring throughout the classrooms of the 1980s in a wonderfully accurate appropriation of Joey's method of communication, but I even saw kids tucking their arms up under their sleeves, so that just the elbow was visible like a stump, and gleefully waving the supposedly stricken appendage along with the aforementioned facial expression and noise, best obtained by sticking the tongue behind the lower lip.