I am up to about 13 tattoos now and I still get the brilliant comment from un-tattooed people of "I didn't expect you to have tattoos" or "You don't look like a tattooed person." Which makes me beg the question is there a specific combination of piercings, ripped jeans, and t-shirt from an obscure 80's rock band that I need so that people aren't surprised I have tattoos. It just baffles me as a comment.
Also I work with kids and quite often have entertaining conversations that simply start with them stating "You have a tattoo." This opens up a world of fun and mildly sarcastic responses from shock that I have two half sleeves and pretending I didn't know they were there to convincing them that I wake up early every morning and draw them on with Sharpies. I probably shouldn't, it's a bit cheeky of me, but it is great fun.
Another thing that confuses me though is when people seem to think that they can demand to see my tattoos in full. This has on occassion resulted in some un-tattooed people requesting, quite politely, that I take various items of clothing off. Most recently this happened at a wedding when the mother of the groom demanded I take off my shirt so she could see my half sleeves. Very awkward in the middle of the reception and it was probably a good thing I hadn't had more to drink at that point or who knows what would have happened.
There are always the normal questions though of "Did it hurt?", "How much did it cost?", "Don't you think you will regret it?" etc. They are always fun to answer sarcastically as well otherwise it just gets repetative.