I have noticed that old men, 65 and up, have naturally creepy tendencies...
Staring intensely at women from across the room... saying ambiguous or vague comments then laughing really loud at themselves...
"Boy, it's hot today... Makes you wanna take a mud bath, don't it? hhhhhhhhhhhhhhyahyahya"
You know the laugh... the laughs that sound like a car having a hard time starting... They are kind of whistly.
Lastly, nothing is creepier than a smile and wink. Especially when you employ any of the other creep techniques while doing so.
With the 65 and under creeps... it is mostly staring at people and not talking much that is creepy.
Another thing I find especially creepy is when someone kind of follows you around. If you are talking with a group of people, the creep will kind of hover around behind the people, silently observing the social interaction.
Signatures are for fags