Whenever Peter Parker senses danger, squiggly lines emanate from his head, and half of his mask magically appears. Sort of...
A while ago, I came across a half Pete/half Spidey-head keychain. After hollowing it out and painting, I attached it to a Peter Parker body. The spider-sense lines were made from twist ties from toy packaging. And, in case anybody's wondering, "ESU" stands for Pete's alma mater, Empire State University.
Thanks for your time. Comments are always appreciated.

'til next time,

TommyX