A quiz I came across recently...
Complete the sentences below, so each sentence is true. (There are two possible correct answers that I know of.) The digits in the sentences themselves count towards the total, and the digits you put in the answers count as well. If you get a 2-digit number, it counts for both digits, of course - so a 13 would increase the total count of 1 and 3. Digits in this explanation don't count, only those in the actual quiz.
The number of times the digit 0 appears in this quiz is __________
The number of times the digit 1 appears in this quiz is __________
The number of times the digit 2 appears in this quiz is __________
The number of times the digit 3 appears in this quiz is __________
The number of times the digit 4 appears in this quiz is __________
The number of times the digit 5 appears in this quiz is __________
The number of times the digit 6 appears in this quiz is __________
The number of times the digit 7 appears in this quiz is __________
The number of times the digit 8 appears in this quiz is __________
The number of times the digit 9 appears in this quiz is __________
[EDIT] There's now three solutions I know of, a friend of mine found another one.