A colleague's dad just had his bike nicked from right under his nose.

A man went over to look at a bike he had advertised, he looked genuine, even spent half an hour chatting and then asked colleagues dad to ride up and down the street. The guy didn't even ask if he could ride it.
Then while the engine was idling, he pretended to look over the bike, then said the handlebars looked a bit loose and whether he can get a screwdriver to tighten it. So colleages dad turned around to get the screwdriver......

you know what happened next. The thief even had the gall to wave byebye as he sped off.

so never turn your back for even an instant.