I lurk on various news and special interest forums. Occasionally the commenters get carried away with cascading puns.  For example:

Did you hear about the man who cooled himself to absolute zero? He’s 0K now.

So I’m not the only one who likes Chemistry humor after all.

I know. I take lame jokes to new Fahrenheits.

I think all my jokes are real joules.

Don’t tell me; you torr something laughing?

I’m starting to dislike the atmospheres in here.

Ohm my god, it’s getting worse.

That news wouldn’t be newton to me.

Could it be that all the good jokes Argon?

I’m worried that the puns will start to get Bohring.

I guess we’ll have to Barium.

How’s this: Helium floats into a bar. The bartender says, “We don’t serve noble gasses in here.” Helium doesn’t react.

A gold atom walks into a bar. The bartender says, ” ‘ey you!”

Heisenberg is driving down a road when a cop stops him. The cop comes up to the window and says, “Do you know how fast you were going?” Heisenberg responds, “No, but I know where I am.”