I say duck tape and spell it duct tape because I am too lazy to pronounce duct and *grabs scissors*youre not going to get me with that.
*Sigh* I know you have to type that you're being sarcastic or it doesn't work and typing it lessens the effect though it's a lose lose situation
Actually, the easiest way to make something seem sarcastic is to put a smily in it, like a wink or tongue smily. So like, you could go "right" and people would think you mean it, but if you say "Riiiiight... " they'd be more inclined to think it's sarcastic.