Building an exact replica of the Enterprise’s Main Bridge in your parents’ basement: $4,275

Knitting lessons so you could make your own uniforms: Free at your grandma’s house, as long as your promise to try a sport when the weather gets nice out.

The sound of your girlfriend’s adoring voice as you describe the Uhura mini-dress you’ve made for her: $3.95 for the first minute and just $2 a minute after that. Connection fees may apply. Must be 18 or older to call.