I stole this from my son.
The Higgs Boson walks into a church.
The priest says, "We don't allow Higgs Bosons in here, this is a place of faith."
The Higgs Boson replies, "But without me, how can you have mass?"
And, as often happens, I then thought of this one.
Two hydrogen atoms are walking when one says, "I think I lost my electron."
The other says, "Are you sure?"
"Yes, I'm positive."