Found this definition while googling for inspiration:
"irony involves two audiences, one who understand the true intent of what's said and one who doesn't".
So, to meet the challenge you must have an audience who "don't get it". Unfortunately they will all give you ones. Ironic?
I finally saw what I'd consider to be an ironic photograph on Saturday. It is a print by Andy Warhol, of a traffic accident. Two ambulances returning from attending the same car crash collided with each other on the way back to the hospital.