We have a horse at our barn that can be a bit high strung in some situations. The only way to calm him down is to hold his tongue. He will stick it out and he just wants you to hold it! Whatever works!
Interesting. I too have had an issue. My issue was with cross-tying. My mare, no matter what tricks or treats, was acting up in the cross-ties. She refused to stand still, would do this half-rear etc. I decided to tie her in her stall. Not sure why but she is ok with this and I said well if this works this is how we will do it. I am still working with the cross-ties but as a training session now without the stress of trying to groom and/or tack up.