00:00He squeezed the toothpaste out of the tube, racing to beat the other student.
00:05Thick lines spilled across the table, and within seconds, the tubes were empty.
00:10Then the teacher told them their next step.
00:12Put all the toothpaste back inside the tube as fast as possible,
00:17and whoever finished first would win.
00:20Now they started scooping it up, trying to shove it back into the opening,
00:24but it just smeared, slipping and spreading everywhere.
00:27The more they tried, the messier it got.
00:31After 10 minutes, both tubes were still empty, and the teacher explained,
00:35you can try all you want, but some things just don't go back once you've let them out.
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