Ditch
When you're driving, you may notice the flags in the dirt near the exits. These flags mark the ditch running along the side of the road. You won't want to try to exit the road here or you'll end up stuck in one.
Picture the flags in the dirt. Picture the ditch just over the edge of them. Now look for another way to exit this road, cause that way is just not a good idea.
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ほり
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If you do end up veering into a ditch you'll find yourself yelling, "Holy (ほり) crap!" Then you'll go hurtling into the ditch.
It's a pun, get it? Holy. Hole-y. The ditch is a long hole. See? It's funny.