As the spring semester begins, you're probably still adjusting your schedule.

Dropping some classes because the professor was scary on the first day or trading in your 8 a.m. class for a noon one. If you skipped the first day, it's a good sign that you won't wake up in time for the next class either.

You might as well try to get in something fun to lighten up your load and give yourself a little break from those stuffy lecture classes.

As other students swap their classes, too, you might just get lucky and snatch a seat at the last minute. So here are five classes worth putting your name on a waitlist for.

1 Introduction to Human Space Flight

So for all you smarty-pants aerospace engineering students, it doesn't get much better then this. Introduction to Human Space Flight, ASEN 3519, is taught by CU alumnus and former NASA astronaut Jim Voss.

The class covers everything from the history of humans in space to crew accommodations to space tourism. The class already had 40 students enrolled and six on the waitlist in late December, so you better get your name on the list ASAP if you want an actual astronaut for a prof.

2 Digital Media I

Learn how to use creative software such as Dreamweaver, Photoshop and sound software to create digital projects in Digital Media I, ATLS 3010.

Students will produce creative projects using sound, graphics, photography, animation and video. You'll also learn some Web design techniques.

Four ATLAS instructors share the class, so there's a good chance that you'll like at least one of them.

This class also has a waitlist, so get on it quickly.

3 Trash and Treasure, Temples and Tombs: Art and Archaeology of the Ancient World

This Arts and Sciences course, which counts for core-curriculum credits, teaches students about the art and architecture of ancient humanity.

For those of you who think this sounds boring, keep in mind that you won't just be looking at photos of the art you discuss. Professor Elsbeth Dusinberre might just choose you to model one of the columns at the Colosseum. She often asks students to pose as portions of walls of ancient Rome to demonstrate the Romans' architectural tricks.

So grab your spot on the waitlist for CLAS 1509 or ARTH 1509.

4 Studies: Shipwrecks, Mutinies & Catastrophes at Sea

Ahoy, mateys! If it's shipwrecks, mutinies and catastrophes that interest you, HUMN 3092 might be the right class for you this spring.

Professor Davide Stimilli explores adventures at sea through this Tuesday/Thursday class. Put on your eye patch and peg leg and hobble into a late-afternoon class to get some humanities credits.

The enrollment limit is only 35 students, so get on board soon.

5 Hip-Hop Poetics

With five sections offered this spring, Hip-Hop Poetics had only two sections with remaining seats as of late December, while the others already had begun a waitlist.

This English course, ENGL 3856, is a Topics in Genre Studies class that is not available to freshmen. The class discusses the cultural impact that rap, as poetry, has had on the world.

From the history of rap to the development of DJs and break dancing, this class could offer a musical break from the typical lecture course.