I don't have any too recent stories... I don't get out much and also don't pay a whole lot of attention to other people anyways, but I have a couple memories.
One was when I was in either grade seven or eight (13-14 years old) and it was actually a story I heard from my mum, and thus thankfully didn't witness myself -- although it's stuck with me nonetheless. Our school jazz band (of which I was a part), was playing a concert near the end of the year, and my parents attended (along with many other parents, of course). Anyways, my mum and dad were seated behind the mum and step-dad of a sort-of-friend of mine/my best friend's ex/guy who had an obsessive crush on me/dude who later turned out to be gay (yeah, it was weird), and his mum was pretty much feeling up her husband the entire time. I mean, not in the ummm... genital area... but everywhere else. She was massaging his shoulders and neck, nuzzling up against him, fondling his hair, etc. My mum said it was distracting and annoying as heck -- not to mention fairly inappropriate at a middle school concert.
Another somewhat more recent memory is when my husband and I were standing in line at the pharmacy waiting to fill a prescription of mine and there was a middle-aged couple in front of us. The husband (or boyfriend or whatever) had his hand in the back pocket of his wife's/girlfriend's pants and kept squeezing her ass playfully.