Silver sharpies and gold sharpies work fine for me. You may want to look for retractable sharpies if the air dries them out. I recommend holding then point down and not removing the cap until the signer is just in front of you.
"The sexual energy between the mother and son really concerns me!"-random woman behind me at Next to Normal
"I want to meet him after and bang him!"-random woman who exposed her breasts at Rock of Ages, referring to James Carpinello