I didn't have a chimney growing up either, so my parents told me he used the front door. LOL
Also, one time I caught my dad putting presents under the tree wearing a santa suit, and I ran up to him and started talking to him. Then I noticed he had the same glasses as my dad, and he told me that they shop at the same place. Then I asked why he had the same ring as my dad (it was a class ring), and he told me they went to the same school. She I told all of my friends that my dad went to school with santa.