The worst class of my undergrad life was classical quantum mechanics only because I delayed it till my senior year and the last time I took a math class was partial differential equations during my freshman year. The theories I could gobble up in a heartbeat but some of the mathematical manipulations were just so ridiculous without using mathematica or some other math program. I remember one take home question with calculating the dipole from 1S to 3D orbital in the hydrogen atom taking over six pages of calculus with my microfont handwriting (over three days of work on the problem mainly reviewing my calc skills).
The coolest thing about the double slit experiment is that it shat on the idea that we knew everything their was to know about the world, which was hottly becoming a common belief in the late 19th century.
want to have some fun at home, get a cheap laser pointer, shove it between some heavy books to keep it on, and point it at a white flat wall. then get two credit cards (I used text books to stabalize them so they didn't wobble) and have them make an extremely thin (sub millimeter) slit that the laser can see through and then stabalize everything that way. Go to the wall, and you will see a single slit diffraction pattern. Next hang a rock from a string and then hang the string from a platform and have it intersect the laser coming from your slit right in the middle. next do the credit card thing again to the string in the middle to make a double slit. They have to be very close to each other and they have to be close in size and maybe about 2-3feet from the first slit or less if you want, but atleast ten feet away from the wall and wallah, you just proved that light is a wave. Without having two guys to help you or some creative stabalization methods, this easier said than done, but what is more fun than a in home double slit experiment reproduction. If you are interested, I can give more detailed plans or do a you tube video and even show you how to get the cathode ray tube out of an old CRT monitor or tube tv and use the phosphorous screen as a detector for the electron part of the experiment.
Oh yeah and the diffraction pattern will be very small unless your wall is really really really far away and you have a really bad ass laser. have fun.
EDIT: By the way, the heavy handed mathematical manipulations in the class seem to have a knack for taking out all the fun in these theories.