My girlfriend lives out in the country and likes to sit on the porch in the evenings. For years she's been using citronella candles and the place looks like a forrest fire with all the smoke.
So I'm sitting there this past spring and ask her why she didn't use a thermacell? Of course she had never heard of it. So I went to my truck (as all good rednecks do) and got my thermacell and turned it on and set it on the porch.
Needless to say I no longer have that thermacell. I had to go buy another one for me.
Lesson learned.
Keep my mouth shut about how good a thermacell works unless I'm willing to go buy another one.