In recent years I have hacked and reported hacks on multiple "big" Dutch companies.
Without going in to much detail I will use this page to tell about some vulnerabilities that I found.
First on the list is PostNL, whom reacted very nicely! Read more.
Also Solcon who gave me a year of free internet :)! Read more.
Q-dance, I found XSS on their website, they gave me tickets to a show :D! Read more.