I once tried to order some drinks in a noisy bar in France. I thought I was explaining it ok but was not being understood by the girl behind the bar. It got really awkward and was making me seriously question my French (I'm English). Eventually it turned out that she was Irish and had equal but opposite holes in her own French. We had a good laugh about it and spoke in English thereafter.
Had she been Scottish tho we probably would have still been better off speaking in French.
I backed into someone in a crowded bar in Sapporo and said excuse me in Japanese and heard the same thing behind me. We both turned around at the same time and saw we were both foreigners.