Cross Pollination between Squash and Cucumber

Several gardens have some funky, round little cucumbers and we discussed the issue of cross pollination between the squash and cucumbers.  According to a few experts, while both are in same specie, cross pollination is unlikely.  Cross pollination can occur quite easily between squash varieties.  You might find this article from Purdue University intersting: http://www.ag.purdue.edu/counties/allen/Documents/Hort%20ACH31%20Cross%20Pollination%20in%20Cucurbits.pdf
and this link on ehow.com helpful:
http://www.ehow.com/info_8427323_can-cross-pollinate-squash-cucumber.html