What you want to do is hold up a thumb to the mushroom cloud. If your thumb fully eclipses it, you’re fine. If not, you’re in the Gender Zone and need to get back.

at least twelve teslas

Gender reveal party safty card format:

GENDER REVEAL DEVICE … GENDER REVEAL CAPACITY… MINIMUM SAFE GENDER REVEAL DISTANCE

S()C(DE B**B… 20 LBS… 110 FT

BRIEFCASE… 50 LBS… 150 FT

CAR… 500 LBS … 320 FT

SUV/VAN … 1,000 LBS … 400 FT