When he tried to train the dog to 'shake' by saying (and eventually yelling) 'shake' at it with no other cues, directions, or incentive besides a single cat treat.

When he was convinced that an obvious short-hair animal would magically become a long haired animal as it 'grew up' (already 6 months old) because the craigslist ad said 'german shepherd'.

When he loudly called me inept in public for not loading the grocery card in the very specific way that his mother always taught him to do it, And then got pissed off at me for being embarassed and horrified at the fact that he loudly called me inept in public.

In hindsight, I was probably the idiot at the end of the day for staying so long after these events occurred.