Chaim B. asks according to the opinion that there were actually 24 spies (recorded in a Yerushalmi) -- how can this be, given that we deduce from the eidah that a minyan needs to be composed of 10 people?
This reminds me of an ethnic joke -
Q: how come it is so difficult for [insert ethnic group here] Jews to form a minyan?
A: (counting on fingers to Tehillim 28:9) ♫ hoshi'a es amecha, uvarech es nachlasecha, ur'em, ur'em ur'em, ur'em venase'em, ur'em ... ♪
And another joke, basically which says that we are really lucky to have had Calev and Yehoshua as spies, because otherwise it would have been even harder to find a minyan.