Photons don't check bags at the airport because they are traveling light.
「光」在機場不托運行李,因為是「旅行的『光』」(輕身上路,沒有行李)。
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這句雙關語寫在美國科羅多州「印地安山社區」公路旁的「雙關語路標」上,每週都有志工更換有趣的雙關語。
P.S.
1. 以下是網路上的另一則「travel light」雙關語笑話。
A photon walks into a hotel.
The desk clerk says, "Welcome to our hotel. Can we help you with your luggage?"
The photon says, "No thanks, I'm traveling light."