A virus walks into a bar. The bartender says, "We don't serve viruses in this bar."
The virus replaces the bartender and says, "Now we do."
An infectious disease walks into a bar. The bartender says, "We don't serve infectious diseases in this bar."
The infectious disease says, "well, you're not a very good host!"
Two bacteria walk into a bar. The bartender says, "We don't serve bacteria here."
The bacteria say, "but we work here! We're staff."
Some helium gas drifts into a bar. The bartender says, "we don't serve noble gases in this bar." The helium doesn't react.
A room-temperature walks into a bar. The bartender says, "we don't serve superconductors here."
The superconductor leaves without offering any resistance.
A neutrino walks into a bar. The bartender says, "I'm sorry, but we don't serve neutrinos here."
The neutrino says, "that's okay, I'm just passing through."
I stole these from Brian Mallow http://www.youtube.com/watch?v=r-iP5dh54T8
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