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Dunno if I shown this before, but:

import sys
from itertools import cycle

functions = cycle([str.upper, str.lower])
phrase = sys.argv[1]

for char in phrase:
    func = next(functions)
    print(func(char), end='')

print('')

(Yeah, not checks if you forget to pass the phrase in the command line, but... 192 characters, babeeeee.)

Well, 257 bytes so far and I can't cycle through char::to_uppercase and char::to_lowercase 'cause they have distinct traits (so I can't build a vector with both). I could write my own wrapper functions, but that would just increase the byte count.