Having stitches in your lip. Not the actual stitches that are painful but the injection to numb the lip was awful, especially as a 10 year old!
The injection before stitches really hurts, and thats coming from a six foot two shaven headed bloke not a ten year old, not sure what was worse the injection in the head or in the thumb.
Also getting a tattoo on the chest as a skinny 17 year old by a drunk tattooist that started arguing with his girlfriend as soon as the ink hit my skin.