I really like doing math problems, but I realize that most kids, even the ones in my advanced placement class do not share my excitement so I try to come up with ways to interject fun into the lessons. I try to do this by taking everyday stuff, music, television, commercials or movies and try to convince my class that the foundations for these things began with math. Here are a few examples:
Draw a picture--Where do you think Kodak came up with the expression "A picture is worth a thousand words"?
Glade--Plug it in, plug it in, when it is necessary to replace a variable with a different variable or a number.
Jeopardy--When we are curve sketching and we start with the clues from the derivatives and second derivatives and end up with the function.
Related Rates--The Song "One Moment in Time"
Reimann Sums--Beyonce's new hit "To The Left, to the Left"
Removable Discontinuities--Jerry McGuire's "You Complete Me"
The creators of CSI thought of the show by looking for clues in math problems.
I tell my students to save money on movies, go to McDonald's with their friends on a Saturday night. Order from the $1 menu. Take extra place mats and bring plenty of writing utensils. Entertain can be had by figuring out "exciting" problems on the back of the place mat.
I also try to interject real math topics. For example, I tell them how L'Hopital actually stole his rule from the Bournoulli brothers. Of course I embellish it a little, but the idea is still there.
I know this stuff is corny, but it seems to keep the kids entertained and working at the same time.