Earplugs

[MrDK]

When ascending matters take care of themselves concerning ME pressure as the eustachian tube expands and releases pressure ... slight bit of comfort, but generally no big deal.
When descending the eustachian tube may collapse and it can be painful and can last for hours after getting on the ground.
"Pinching and blowing" is a great option ... and do it often.
Yawning, water, chewing gum or hard candy are options as well

[Scuba+]

I've started using earplugs in the cinema, the adverts blow my ears out over here. I actually couldn't find my earplugs so instead used in ear earphones, works ok