Sometimes you can't make a client happy, even if that client is your brother. My brother asked me to make a poster for his son's 2 year birthday party. After last year's poster, I definitely will do this every year.
This year he said this: "Don't feel obligated to use a picture of Bennett, but rather make it like one of the posters you normally make." I then went through some old mags and papers and decided to flip a 60's porn movie poster into a 2 year old's birthday poster. I don't know why, but I thought it was a brilliant idea. They ultimately loved it, but felt it was a little to raunchy to put up at the party. So instead, I made a two headed duck poster which I must say fits swimmingly for their party.