Standing an egg upright

I didn't quite expect it to happen but it did! There is this story going around that eggs would be able to stand upright on the day of Li Chun (立春), the fourth of February, which, according to Chinese astrology, signifies the beginning of Spring. My scepticism got the better of me and I went down to the kitchen and try it out for myself. Well, believe it or not, this was what happened....