You need to get over your high horse

This gem was spoken from someone with an attitude.  It is a congruent conflation  of “get over yourself” and “get off your high horse”, both meaning to become humble or less haughty.  The appearance of “your” in both phrases contributes to the mix up.  The image of jumping over the horse in gym class also might have been in the speaker’s mind.  The congruent conflation (two or more blended idioms having the same definition) is perhaps the best kind of malaphor.  A big thanks to Steven Russell for hearing this one and Katie Hatfield for passing it on!