I've got an Anthony Head one too
Back when I worked in a charity shop years ago we had a load of Buffy stuff donated (brand new books etc) and every now and again Anthony would pop in to see if there was anything that needed signing, which was lovely as the items then got sold for a bit more for the charity.
I met Rik Mayall a few years ago after a theatre performance. He was so lovely, we had a chat and a photo and he gave me a hug and a kiss and signed my programme. He smelt really nice too. I was so happy as I had been a fan for so many years and he was one of my favourite people ever.
Dh loves Michael Palin and met him a few times at talks and book signings. I always liked him in 'Ripping Yarns' and so once when dh went to a signing (for MP's new series at the time) he also took my Ripping Yarns book to see if he could try his luck. When it was his turn and Michael signed his copy dh asked nicely if he could possibly sign my book and he was kind enough to do so, made a nice comment to dh.
Back in January I was in sainsburys, ds had been going crazy in his buggy so I was holding him in my left arm whilst pushing the buggy with my right and with my shopping basket in the buggy. Pretty distracted! Someone's trolly bumped into me and the owner was really apologetic, I was concentrating on ds etc so didn't really look and just said "it's ok Im having one of those days today", and the woman replied "yes I think I am too". She then bent down and picked up ds's raggy thing off the floor and gave it to me, when I looked at her I realised it was Ashley Jensen (off 'Extras'). Her hair looked gorgeous! She seemed lovely.
I walked past Russell Howard in town one day 
Wouldn't mind bumping into Guy Martin but can't see myself at a race meeting anytime soon and I'm not the type to approach anyone tbh, I'd just wave from a distance and blush
I appreciate fans wanting to meet their idols but I can't imagine how crap it must be when you're about to race the tt or whatever and you've got people banging on your van etc