Oh God yes;
If you have the IMC option its a no-brainer, climb and use the qualifications. What got me was un-forecast medium ice at 2400ft. The aircraft went from nice, smart IFR fully toyed piece of kit to a flying ice lolly in about 20 seconds.
The torque shot up as the speed decayed and then she was coming down now matter what I did. I know now I should have turned right instead of left but I made that mistake as the bloke in the back decided to announce his imminent demise.
The next 2 aircraft through there picked up a small amount of ice and lost it in minutes. I just felt persecuted for some months.
The bloke in the back went to hospital where they diagnosed chronic indegestion brought on by the massive fried breakfast he'd eaten while keeping me waiting.
SND