Don't know why but I have totally missed this thing going on in the testing community. Suddenly the hashtag #30daysoftesting started to pop-up in my flows. A short investigation showed that this was a challenge started by Ministry of Testing.
Looking into the details it looks quite simple and fun. My problem now is that I'll be on vacation during most of July and will have a hard time to complete some of the challenges.
As a tester or holding a role within software quality you might want to check it out? I'm going to take a stab at it and see what I can complete out of office...
There's a PDF with all the challenges here.