What Was Your Worst Call...?

Same thing happened my second or third year of umpiring in an High School
Tournament. Ground ball to SS she is heading toward 2B so she taking the out herself but misses the base. I can't make a call until the runner reaches 2b so I wait, runner slides, sell safe. When I turn to first the play is over there and I didn't get a good look at it. Can't guess an out so I call safe. I had a long disscussion with the coach about the call at 2b. When he realises I am not backing down on the missed base he asks about the call at 1b.” The call is safe coach”. He leaves the field very unhappy. In hindsight I should have asked my partner for help with the call at 1b, but the coach never asked me to ask for help.