Ok, so it's a really complicated bug, so bear with me.
Imagine this scenario: I have a two cards in my hand next to each other. One is a permanent and the other one is a spell. When I am busy spamming Fireflys and Decay is busy fractalling his pests, the board gets really clogged and then I lag like hell. So, I want to play my permanent, let's say Electrum Hourglass, and the spell, quintessence is right above it. I click it and then I play the Electrum Hourglass, and then I click on the Quintessence really fast because I'm lagging so hard. When I cancel quintessence, it turns into an hourglass!!!
WTF??
I was going to take a screenie, but it wouldn't prove anything because it only shows 4 hourglasses instead of some ridiculous number like 7. I don't really want to abuse this, but I kind of want to try again so I know this is real and I'm not just high.