Spam, like sarcasm, is often referred to as the highest form of intelligence.
There are varying degrees of spam. For instance, at the lower end of the scale, you have flooding a channel with a repeated line of text, or links to a shock site. The classier spammer will choose a form of ASCII art to flood a channel, such as a figlet, cowsay or epic coloured drawing such as baconcorn.txt.
The only real problem with spam of this magnitude is flooding your buffer. If you're in an active channel, you're guaranteed some Waf is going to combo break, or you're going to get kicked/banned if in a channel such as #lobby. Hence spam is quite useless and this page is now Spam, however it can be very amusing to send to people in private messages.