Here in Mexico it is customary when people greet that they kiss on one cheek. (French foreigners share a kiss on each cheek.) So, we are kissed multiple times daily by numerous friends. Thus, when I recently attended a Stake Meeting there were numerous friends around and there was tons of kissing going on... so, when the Stake President came up to greet me he shook my hand and I gave him a kiss on the cheek. He froze for a second and I said, "Este es apropiado?" (Is this appropriate?) To which he replied, "Ummmm, normalmente, no." (Normally, No.) So, the next time I saw him I stood three feet away and stretched my hand out across the divide - which made President Garcia just laugh out loud! (Lucky for me he has a great sense of humor.)
So, the tip of the day is don't kiss your ecclesiastical leaders - they are off limits!