Some more sign/t-shirt ideas collected from when I first posed a similar question to another group in the summer of 2002:
"Men are good people"
"Men are people too"
"I think -- therefore I'm unmarried"
"If you're not outraged, you're not paying attention to feminism."
"No one is free when men are oppressed" (Guaraunteed to raise ire)
"Shave a feminist today"
"My paycheck - her choice"
"Keep your laws off my lifespan"
"Misandry: it's the new Misogyny"
T-shirt: "If it's wrong to say women are airheads because not all women are airheads,
and if it's wrong to say Blacks are criminals because not all Blacks commit
crime, why is it correct to say men rule the world? Most men don't."
"In western culture we picture women right below the angels, and men just
above the animals."
"Feminists defined sexism; and they didn't define it to refer to anything they ever think or say or do."
"A bachelor is simply a man who has deprived some poor woman of a divorce"
"When women hold off from marrying men, we call it independence. When men hold off marrying women, we call it lack of commitment." -Warren Farrell
Abstract -- Picture of a scale named feminism, weight with rights written on it hitting bottom, weight with responsibilities written on it up in the
air.
"FEMINISM: From each according to HIS ability, to each according to HER LUDICROUS DEMANDS!"