Is that I start thinking I'm immortal.
I've had a druid sitting in the low levels for a couple of years now (he was a resto twink) and never got around to really trying them out until another friend started playing recently.
Well I thought I'd brush him off and have a go. Respecced to balance in the mid 30's quite a while ago but never really got on with it so he stagnated. When I started off this time I was enjoying it straight away (possibly because I'm a bit better with casters now). As soon as I got moonkin I really started enjoying it. Level 61 now with pretty decent gear (3.6k starfire crits) an absolutly loving him, wish I'd realised how good they were earlier.
The only problem I get is I find everything so easy to kill that I keep pushing it more and more. I'll grab 6 or 7 mobs with insect swarm pop starfall, barkskin and drop hurricane when all of a sudden, stun. Definatly a "caw caw bang, f**k I'm dead" moment. You'd think I'd learn from it but noo, a few hours later I'll do it again.