This was asked by blogegog on a YouTube comment (gasp!):
[Regarding Cantor's diagonal argument:]
Couldn't I just make the same statement about rational numbers and say, 'take the largest number [sic he probably meant the one with the most digits] on the chart and append to the end of it a 1 if I'm hungry, or a 2 if I'm not' to show that his list of rational numbers doesn't contain them all?