Ties For a Birthday Boy

A little boy is having a birthday soon and he needs a tie shirt for his big day. Since I don't have a boy or any brothers, I never know what moms want for their boys to wear. I have several nephews and I know they like trucks and swords, Transformers and Buzz Lightyear, but really I am quite puzzled. Help a sister out, wouldya? Mommas of boys, tell me what you like for your little guys.