Be careful when crossing the grade crossing.

Be careful when driving down the declivity.

Be careful when working with high voltage.

The alarm alerts us when there is a fire.

Be careful when handling the spiny cactus.

Be careful of the undertow when swimming in the ocean.

Be careful when walking through the minefield.

He's such a piker when it comes to gambling.

She is a purist when it comes to cooking.

Be careful when handling a razor edge.