Adding to the other comments; I once saw a interesting video of a visual demonstration of that effect and other weird things that happen close to the speed of light. It was this one if i remember correctly: https://www.youtube.com/watch?v=ge_j31Yx_yk
Just like my old physics teacher. Heard stories about him telling the students, that Pd (Palladium) is named after him (his last name had the same abbreviation).
Also jokingly using the screen of a calculator as a scale for weighing metal ball bearings.