>the clock alarm
>my cell phone clock
>the barcode reader on my phone.... it has a function "scan text when it is bluest"
>the toilet stick trgger the ball in the tank
>the ticket reader machine on the bus......suck the MetroCard in when you put your card close enough
>the subway ticket slider reader
>the dial on my fan
>the light switch
>the fancy paper towel machine in the pub at Lower East Side....photocell sensor
>so does the auto-flush toilet and water tap there
>the mad driver on my block.....he horned me when I tried to across the street