According to the ALT text for this XKCD strip, if you click the first article-text link that is not in parentheses or italics for any article, you will eventually end up at Philosophy...I tried two different articles (one of which was Spam (food)), and it seems to be working...let's list how many steps it takes to get from one page to philosophy (and see if there are any exceptions to the rule)...
Spam (food) > Canning > Food preservation > Food > Plant > Life > Physical body > Physics > Natural science > Naturalism (philosophy) > Philosophy (10 steps)
Batman > Character (arts) > Representation (arts) > Semantics > Meaning (linguistics) > Linguistics > Human > Extant taxon > Biology > Natural science > Naturalism (philosophy) > Philosophy (11 steps)
....Spam is closer to Philosophy than Batman...[]
Spam (food) > Canning > Food preservation > Food > Plant > Life > Physical body > Physics > Natural science > Naturalism (philosophy) > Philosophy (10 steps)
Batman > Character (arts) > Representation (arts) > Semantics > Meaning (linguistics) > Linguistics > Human > Extant taxon > Biology > Natural science > Naturalism (philosophy) > Philosophy (11 steps)
....Spam is closer to Philosophy than Batman...[]