['My 6th birthday party was unexpected.  My mom had picked me up from school and said I needed to finish homework before I could open my present.  So I went to my room but when I turned on the lights all my friends from school were there hiding and shouted SURPRISE.  We ditched homework and played games the rest of the night.']
That sounds like a really fun and joyful surprise.  Young birthdays are amazing.
One fond memory I have was my 6th birthday party. I was on my way home from school and my mom told me she had baked a cake and got the present. But I could only open it after I was done with homework.  When I got to my room all of my friends from school were there.  We ended up ditching homework and playing games the whole evening.