That being said, I once communicated telepathically with my dachshund Willy when friends and I were hiking with him in an extremely altered state. When I noticed he would come to me by just thinking/calling him with my mind, I told my companions who were in an equally altered state about it. I then proceeded to test my hypothesis. To my amazement it worked and they confirmed it. Other skeptics I've shared this with tend to doubt it, with the usual alternative explanations that occured to me as well, but I/we had set up the test conditions with as much precision as we could muster considering we were otherwise just enjoying our mindless fun.
It didn't make me some sort of true believer set on a path of awaking the masses, but it certainly seemed to defy conventional explanations. Like I've said using the example of alien visitations to Earth for instance, it only has to be true once to be true even if all the other claims of such are bogus.
I like the scientific rigor debunking usually involves such as asking what is the medium for transmission. And then I think about Arthur C. Clarke's observation about any sufficiently advanced technology appearing as magic. I think some of the capacities of living things and the human brain are not yet fully understood. Just recently I saw some talks given by lawyer and activist Daniel Sheehan who talked about the possibility that some modes of perception might evolve in the same way that eyes evolved resulting in perceiving a particular segment of the energy spectrum with a previously unknown clarity.
Maybe time will tell.