I know the picture quality isn't great (picture of a picture with my non-zooming cell phone camera), but the resemblance between my grandpa in the late 70s and the 4th Doctor is quite striking.
I was excited.
Another exciting thing my friend Ken informed me of is that I actually saw David Tennant in "Comedy of Errors" and "The Rivals" onstage in London in 2001. His sister is working on procuring a picture of my 15 year-old self mock-licking his face on a poster. Didn't even realize it! What a trip!