Strawberry Jam
Q - Why was the baby strawberry sad?
A - Because his parents were stuck in a jam!
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Explanation Please! - This is a play on words. The word 'jam' has more than one meaning, in this joke it could be:-
1) A sweet soft food made by cooking fruit with sugar to preserve it. It is eaten on bread or cakes.
or
2) A large number of vehicles close together and unable to move or moving very slowly: