A day of fasting and penance commemorating Christ's death on the cross. In the church liturgy then the purple color is obligatory.
Good Friday favored fortune-telling. The old tradition says, that the seedlings sown at midnight that day will have twice the number of petals. According to beliefs, Satan loses power over the earth that day, and the beans sown on Good Friday grow on the day of Christ's resurrection. There was also a superstition, that exploding parsley on that day could bring death to one of the household members (in some parts of the UK, people have so far been reluctant to distribute seedlings on Good Friday).
In Pennsylvania, it was customary among Dutch settlers to whip peach trees, that they may bear fruit abundantly. Figs were eagerly eaten that day, hence the habit of crawling as well fig wine.
Marbles is a popular game in Sussex and Surrey, known since Roman times. To this day, on Good Friday, the World Cup Games Championship takes place there.