Sometimes the best thing you can do is keep your mouth shut. Otherwise you can find yourself in the middle of a long rambling explanation that leaves you sounding guilty of something.
Take for example the situation I found myself in when the police came knocking at my door. Two of them, fully decked out. And they say to me:-
We were wondering if you had seen anyone suspicious lurking around the old ladies house across the road.
I stand there with my slightly concerned, yet helpful face on. They go on to explain that the old lady has been away for a few days and when she arrived home she found her garage door slightly open so rang the police to report someone had broken into her garage.
And there was a fraction of a second where I almost considered telling them the truth. I almost said –
Yes, that would be my husband.
Then I would have had to go on to say that, well our cat went missing you see and I noticed the old lady's garage door had been open and I thought the cat may have gone over for a sticky beak (because cats are like that aren't they). So anyway, I said to my husband 'you should go over and have a look in the old lady's garage just in case big man is in there'. So he did (big man wasn't in there) and obviously (being a trouble maker) he didn't shut the garage door properly and now the old lady has come home (and totally over reacted in my opinion), reported it to the cops and here you are. Case solved.
But that could have lead anywhere.
So I shook my head and said
No, sorry, I haven't seen anyone.