This self checking worksheet features finding vertical asymptotes and holes in the graphs of domain of functions. This worksheet requires lots and lots of factoring of a quadratic function: some with the 'a' term and some without, and some difference of two squares. My Algebra 3 class would rather do a worksheet that problems in the book, so I made this just for them. (I think they actually like my jokes, but I will not tell them I know.) Upon completion of this worksheet, the students will reveal the punch line to a riddle.