When I was a child I once wanted to act sick, I don't remember why. Normally my mother would give me the thermometer for me to insert rectally, under the blankets, then leave for 3 minutes and come back to pick it up and read it. I tried warming it up by putting it close to the bedside lamp.
It was however difficult to pull the trick properly and the temperature went too high, so I shook the thermometer down and re-heated it. I now don't know exactly what I was fumbling but my mom came back unexpectedly (I think there was something else she wanted to do in my room before the three minutes) and caught me.
Oh boy. She scolded me, then went to pick up a tube of vaseline, took me to her bedroom (not to bother my little brother I think), sat on her bed, pulled down my pajamas, took my temperature baby-style, across her knees and then... spanked me.