This article presents ideas behind science and technology challenges and shares experiences of "egg races." Different challenges were set, but there was always the need to transport an egg across some obstacle course without breaking it. It was so popular in the 1980s that the term "egg race" came to mean any kind of simple practical problem solving. Auty later connected with fellow teachers in another school and expanded this competition into more involved and complex challenges. The events described have been competitions with unseen challenges. Some achieve instant success, but others fail to produce a reasonable result in the time available. This kind of activity lends itself to teamwork rather than individual challenge, but it is important that everybody should be able to contribute.