Bribe
Someone is offering you a shellfish in exchange for a kiss. This is a bribe! You don't want to kiss them, but that shellfish sure looks tasty.
"Come on, don't you want this shellfish?" they ask, shaking it up and down at you.
ろ
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You go through with the bribe and kiss the person, but then they snatch hold of the shellfish and run straight down the road (ろ). No!!
This is why you never accept a bribe. One second you're staring a yummy shellfish in the face, and the next you're standing alone in the road feeling used.