Ran out of toilet paper, so had to start using lettuce leaves... today was the tip of the iceberg.
Lettuce Substitute
Explanation
The humor comes from the ridiculousness of using lettuce as a substitute for toilet paper. It's funny because it's such a bad solution. The "tip of the iceberg" implies that things are going to get even worse or stranger, escalating the absurdity.
B
Lettuce all pray for when we run out.
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must of bin painful hehehehehehe