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A hole.
Correct, and the first one!
Helium.
I think helium would leak an awful lot out of a barrel, but it would be fun to pour SF6 into there and float little paper fishing boats inside.
Lighter fluid.
Fire?
A candle
Answer
A hole.
Congrats to people who got it right!
A light
Bleach.
Feathers?
A hole
Also correct!
Copium
