Either you or your friend is wrong. ✬

I ran across an old friend near the bank. ✬

Lend your money and lose your friend. ✬

I ran into an old friend. ✬

An old friend of mine dropped in on me for the first time in ages. ✬

You are my best friend. ✬

I ran into an old friend of mine outside the station. ✬

I took shelter under my friend's umbrella. ✬

I have a friend whose father is a famous pianist. ✬

Mary won't listen to her friend's advice. ✬