Note that there is a certain level of arbitrariness involved in this association game. For instance, if a household regularly is in need of both parsley and also condoms, the fact that they are purchased together may be a result of the pure coincidence that both were empty/used up at the same time (which is also a function of the package sizes of both items). We would be much less surprised at the mined associations if we took a longitudinal, per-household look.
Furthermore, a shopping basked is per-household, but not per-person: the parsley and the condom may be used by different members of the household, or be shared, or be part of a gift to someone outside.
The human brain also tends to make up "causal" connections between any two items, when the real reason is often much more mundane.