Go around dancing like a drunk guy and screaming the lyrics to "What is Love" 由 Haddaway in everyone's ears. Guaranteed to work, although it might not produce the results 你 wanted.
What's the point of attracting the momentary attention of passing stranger? 你 don't need other people to justify your existence. If no one is looking at you, 你 won't disappear. Your not some kind of vampire that needs acknowledgement to survive.
You'd be surprised how many people notice 你 already--this I know from experience.
However, if 你 do want 更多 attention, and 你 don't want to do anything too drastic, wear something that's unusual for you, 或者 style your hair a little differently. That will get others asking what's going on.
Stay true to yourself, and do things that 你 wouldn't normally do. Step outside the 三角形, 三角 a little bit and be wacky! Be cookie monster and eat everything! Don't be a wallflower!
scream "I'm a banana!" infrount of a crowd of people 或者 if 你 wanna be a sane person just try to get yourself out there. Talk 更多 或者 maybe 显示 off a talent.