Some collective nouns I like

a lie of politicians
a whistle of modems
a mass of catholics (obvious, really)
a slice of circumcisions
a number of mathematicians (a kind of bland, but subtle one, to my way of thinking)
a prevarication of consultants
a spread of nymphomaniacs
a tedium of cricketers
a whored of prostitutes
a lechery of priests


and one I made up myself ....

a Liberal Party of mental midgets