Collective Souls

If the collective noun for goose is gaggle, whale is pod and dove is exaltation (cute, eh?), what is the collective noun for gradfolk?

I suggest:

a procrastination of gradfolk
a laze of gradfolk
an insomnia of gradfolk
a neurosis of gradfolk

How about Professors?

a tenure of professors
an exasperation of professors

Any other suggestions? We could petition the Websters people...