Ahh here comes a new one.
So my recent session we are gonna save the world.
We go to ask an Earth Genie and we see some drow fighting it.
We kill the drow and then we talk to the Genie.
I figure out that she is lying and i see a faint illusion around her so i dispel it.
Boom new drow lady. We kill her and continue in and find the real one. Shes trapped in a gem and we need an 8th level spell sunburst to get her out. So she shows us what we need to do and says we can come back for her. I then realize that i bought lots of stuff back in town like sun rods. So here is the conversation.

Me: Would a sun rod work?
DM: no to low level
Me: ... What about 20?
DM: Hmm.. That might work if you beat a dc
Me: .. What about 20 of them and Daylight spell?
DM: that would work....