A turing machine can't solve the halting problem, but it can solve the hilarity problem, right gang?

humour.py

prepositions = """
    aboard, about, above, across, after, against, along, amid, among, anti,
    around, as, at, before, behind, below, beneath, beside, besides, between,
    beyond, but, by, concerning, considering, despite, down, during, except,
    excepting, excluding, following, for, from, in, inside, into, like, minus,
    near, of, off, on, onto, opposite, outside, over, past, per, plus,
    regarding, round, save, since, than, through, to, toward, towards, under,
    underneath, unlike, until, up, upon, versus, via, with, within, without
    """.split(', ')

def co(word):
    if word[:2] == 'co':
        return word[2:]
    return 'co' + word

def make_funny(phrase):
    for prep in prepositions:
        pos = phrase.find(' ' + prep + ' ')
        if pos >= 0:
            pre = phrase[:pos].split()
            post = phrase[pos:].split()[1:]
            funny_pre = pre[:-1] + [co(post[0])]
            funny_post = post[1:] + [co(pre[-1])]
            return ' '.join(funny_pre + [prep] + funny_post)


print(make_funny('internet of things'))
# cothings of cointernet

print(make_funny('coffee into theorems'))
# cotheorems into fee