Eric writes in about his Arduino controlled Silly String shooter…

here’s a quick rundown of what it does:
 
Sequence of events:
-Detect motion (IR sensor)
-Trigger Silly String (servo)
-Play sound (funny laugh on a $4 Wal-mart toy recorder)
-Transmit RF signal to second Arduino
-Second Arduino receives RF signal
-Wifi shield sends tweet (follow on Twitter: hackolantern)
-Wait 20 seconds before it can shoot again