Song, Sing
If you lack a lip ring (or two in this case) it's going to make it way easier for you to sing a song.
Imagine a song with lip rings. Then imagine one without. Sing them, pretending you have lip rings. It doesn't work as well.
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You're singing a song with all these lip rings in your mouth and you sound terrible. You're on the side of the road singing. People are freaking out. Finally, someone drives into you with their car (か).
Imagine yourself getting hit by this car. All the air flies out of you as you sing your song. You think "I shouldn't have tried to sing a song with all these lip rings..."