Someone just referred to warrant canaries as a dead man's switch, so my brain went immediately to this. Apologies to Oingo Boingo:

I was struck by lightnin'
Walkin' down the street
I was served with warrants that I had to meet
It's a dead man's switch
Who could ask for more
Government is coming, leave canary at the door
Leave warrant canary at the door

Don't run away, it's canary
Don't be afraid of what you can't see
Don't run away, it's canary
Don't be afraid of what you can't see