Mine wasn't so much time management as general organisation fail:
Waited in the wrong place for my first E&B supervision (outside Zoology instead of Plant Sciences). Realised he wasn't turning up, went to the computing room to re-check the email from him, realised I was in the wrong place, got directions to the right place, couldn't get into the right place, eventually got in half an hour late. Didn't miss much though, so its all good.