UPJOKE
gluonsgluonhadronstrong forcegravitonphotonelectromagnetismparticle physicsinvariant massneutrinoflavourbosonsbosonfermionfermions

What do you think of photons being massless?

-Doesn't matter!

How do we know photons are massless?

They're traveling light.

What kind of pants do ghosts wear?

Massless chaps.

Credit: a student always writes a "joke/pun of the day" on the board every morning. The original punchline was "boo jeans". Other students like to compete throughout the day to come up with a better punchline. I thought this one was so good I'd see if it got any love from redd...

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