My buddy frequently starts conversation with cheap pickup lines... they actually do work if you don't really take them seriously... his favorite to use is "I, uh... lost my phone number... can I have yours?" or "You wanna procreate?"

I personally have heard some pretty lame ones... most of which have already been listed here. Here are some more.

"I just came over to let you know I wasn't winking at you... I had something in my eye."

"Where's the bathroom?"

"I hit on that girl *points at girl* a minute ago... Yeah, she's a dyke. You're much cooler."

"You smell something burning? Oh Shizzz, your ass is smokin!!!!"

"What do you get when you put U and I together... nothing really... just two letters... but you wanna do it??"

"If I said you have a nice body.... would you hold it against me??"

Lame