Explosions in a home, especially ones that could actually happen, should not be joked about, especially in the presence of the inhabitants.

Example:
"Igniter button...where's that?"
"Is it that?"
"Yeah, it looks like it.  It'll look like it it ignites."
"Wait 5 minutes."
"Worst thing is that it will explode."
"Tell me if you smell something.  I can't since I have a cold."
"Me too!  Hahaha....it's connected to the heat."
"...I smell gas."