Today, Donald Duck celebrates his 75th birthday! However, there seems to be some discussion as to whether this is Donald's birthday or whether his film debut should be his birthday. What we celebrate, today, seems to be a combination of the two.
Donald Duck first appeared in the Disney short, The Wise Little Hen in 1934 (hence, the 75 years):
In Happy Birthday, Donald, his birthday is cited as March 13th:
So, between the two dates, we have today as Donald's 75th birthday! The number 13 shows up throughout Donald's film history, including his birthday being mentioned as "Friday the 13th" in The Three Cabelleros. In Donald Gets Drafted, his draft order number is 13 and the recruiting station is number 13.
It's said that this would account for Donald's bad luck in almost all of his appearances and could even turn into a game or challenge like the Hidden Mickeys. How many times can you spot the number 13 in Donald's appearances?