Gender by Height, Weight and shoe-size!
Siraj Raval's 'Learn Python for Data science' playlist Video 1 https://youtu.be/T5pRlIbr6gg?list=PL2-dafEMk2A6QKz1mrk1uIGfHkC1zZ6UU
Find 3 more classifiers from the sci-kit learn documentation and add them to the code. Train them on the same dataset and compare their results.
I've found 3 other algorithms, and they're pretty much accurate.