Round 1 - Judge ChrisHowlett

...because both are required for backpacking around my head . -- PeterTaylor
...because neither are as heavy as Vitenka thinks they should be . -- Bobacus
...because both have been caught drinking cappuccino in Japan with Tom Cruise . -- MikeJeggo
...because both are often talked about in Anglia Polytechnic University . -- Rachael
...because both can be used to power a spacecraft . -- Edith
...because neither resemble Tom Cruise . -- qqzm