Are you bored? Try pasting this, as is, in a cpp file:
// What is going on here??/
Is this even legal C++??/
Yes, it is!
NB: You may have to use -trigraphs to compile this. Try it out! You can use this command:
echo -e "// What is going on here??/Is this legal C++?" | g++ -E -c -trigraphs -
With some luck, this won't be legal C++ anymore after C++ 17 deprecates trigraphs.