I was in a cave and... well, at this point in typing, I just threw together an MS Paint picture:
(broken heart resembles my health being taken down, sad expression resembles my dissatisfaction)
The game must have thought I touched the zombie. I was just in the cave and I suddenly take damage (1.5 hearts) from out of nowhere. I thought it was an arrow, so I started looking about for skeletons, but there were only zombies about, which hadn't even noticed me. I took out the grassy dirt block which was level with my head and I saw the zombie's legs drop down. This was the only conclusion I could draw, since there was no other way I could have taken damage here.
(broken heart resembles my health being taken down, sad expression resembles my dissatisfaction)
The game must have thought I touched the zombie. I was just in the cave and I suddenly take damage (1.5 hearts) from out of nowhere. I thought it was an arrow, so I started looking about for skeletons, but there were only zombies about, which hadn't even noticed me. I took out the grassy dirt block which was level with my head and I saw the zombie's legs drop down. This was the only conclusion I could draw, since there was no other way I could have taken damage here.
[simg]http://img850.imageshack.us/img850/4148/mysigv2.png[/simg]
Never happened with lava though, that's quite odd.
EDIT: Also, for some reason I love the MS Paint drawing, it's quite humorous.