A neutron walks into a bar and asks for a glass of water.
"How much is it?"
"For you, no charge!"
#pun #PhysicsPun #PhysicsJoke

Two hydrogen atoms are walking down the street. One stops and says "I've been ionised"
"You sure?"
"Yes, I'm positive!"
#pun #PhysicsPun #PhysicsJoke

A photon checks into a hotel.
"Do you have any luggage?"
"No, I'm travelling light!"
#pun #PhysicsPun #PhysicsJoke