Not long ago I learnt to make sure you put the top back on your RDA before vaping on it.
I'd taken the top off my Double Vision to drip some more juice in. The top comes off nice and smooth so it makes it easy to drip the maximum amount in rather than through the drip tip.
Got distracted as one does, hit the fire button and went to take a hit.
Sporting a nice blister from the coil hitting my lip