Burnt by oil

Following is an excerpt from an actual conversation that took place between 2 adults, RL and OD.
RL (to OD) - Hi, what happened to your hand? You had a bandage on yesterday.
OD - Yes, got burnt.
RL - Oh!! How did it happen?
OD - Oil fell on my hand
RL - Oh!!!

After a brief pause...

RL - Tel garam tha kya???
After asking this question, RL realized what he had asked; and he kept quite. He was just waiting to finish the conversation and leave.

A long pause...

OD (completely frustrated, with a scorn on his face) - Aur nahi to kya!!! Tel garam hi rahega na...

As soon as OD answered, RL walked away from there.

This is amazing... RL has a good sense of humour. I am wondering, what made RL ask the question "Tel garam tha kya???" ROFL
p.s. - This is not a work of fiction and all characters and their similarities are purely intentional.