This joke will probably only be funny to programmers and other comp sci people, so I apologise in advance to everyone else.
[and promise to laugh at the next chemistry/biology/literature joke I hear even though I won't get it]
Two strings walk into a bar..
One of them says to the bartender "Bartender, give me a rum and coke@#^)(*@)(^##@QLTKJAGl;kaa36alkjy32qua43q47uq347"
The other one says to the bartender, "Excuse my friend.. he's not null terminated."