I was talking to a friend just yesterday. She got offered a job but has to take a drug test and it somehow slipped her mind that this would be a possibility. So when the HR person gave her the offer and mentioned the need for a drug test, my friend said "oooohh yeah, I'm going on vacation this week and next, so I can get that scheduled when I get back."

The HR person said, "we should get it done ASAP before you go on vacation. Delaying a drug test isn't a good look." My friend told me her internal thoughts, which were "dammit can't you just be cool for like a MINUTE!"