Yeah I had some problems finding an intuitive solution to discard a petri dish, I tried a few stuff but was afraid it would happen by accident, so I went for this non-obvious way, which is also a bit weird. Anyway, glad you had fun with it.
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Actually, since the theme of the comic is kinda based on wrong interpretations of feedback, I didn't want to make one or more "solutions". So you always get the 5th bar at one point, but it is indeed random and you don't really have to do anything :D
About the picture it's hum.. an "unsolicited"photo of your friend, hence the "don't trust them". I found the idea funny because they're just stickmen