[Dear guy at North Beach with the "Love Me Or Hate Me" tattoo on your back], et al:
More and more over the past decade people have been branding themselves with body art. I’ll make this short and sweet: don’t get a stupid and/or overly large tattoo…even if you really really want one and think it’ll look really really cool. I’m not saying don’t ever get a tattoo–some tattoos really are unique and say something about the wearer…I am saying, don’t permanently style yourself like a jackass or fad-whore:

Source: All the Fun Facts Blog

Source: Letters from the Sanitarium

Source: Shit My Friends Might Like Blog
Whether you like it or not, people judge you. At least make them judge you about your personality instead of your obvious poor taste. Additionally, giant tattoo’s are an affordable alternative to nothing…your money could probably be better spent.
If you already have a stupid/overly large tattoo, there are luckily evolving new technologies for removal including lasers, creams, and even plastic surgery. Or, maybe you could just get famous via google images??