According to a drunk Cockney, UFOs do exist and aliens may already have landed on earth.
Bert Bertson said, "Aright guvner, apples and pears! Oi've seen them UFOs with me own eyes. Oi was down the market the other day, at the butchers, and Oi had a right good ham shank in the market, really good.
"Anyway, Oi saw this great big craft going overhead - and not just one of em, there were hundreds of em, all headed towards 'eefrow. Oi reckon they must be some invasion going on. They're landing at 'eefrow in their millions, there's a flipping invasion going on."