I usually just point out that until they have a sample of a so called chemtrail analysed their opinion isn't worth bunk.

We have plenty of contrails over head here, I live almost under the main flightpath from Auckland-Wellington and Auckland-Christchurch. Some last for only a few seconds, some last all day, it all depends on the conditions. The Chemtrail believes (CBs?) work on circular logic on this one. Chemtrails are contrails that last more then a few minutes. That some contrails last more then a few minutes means that they are Chemtrails.

*shrug*

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