I am more than happy to give any idea or sighting a go, but my advice to anyone is be skeptical and do some research for your self. It rarely take more than 10 mins to disprove most things like this.
I think to dismiss Bigfoot entirely in all his guises is unwise, there's a of things on this planet we are yet to discover so always keep an open mind. If you consider we have found two new species of primate in the last 10 years it's still a possibility that Bigfoot exists, albeit very unlikely.
As for aliens. 100% exist.
Have they been to earth, based on an understanding of physics (travel faster the light speed is not possible).... then not very likely, unless it was a space dwelling nomadic race (like independence day) then the travel distances are just far to big.
Although I do really really hope that one day we will disprove Einstein and do manage to break the light barrier. Whether it be by simply going faster or by warping space time or one of the other ideas it's the only way that interstellar travel will ever be realistic.
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