We can’t go without food so having to eat these higher and higher prices is painful.

Although a pain in hindsight it's needed - proper ventilation... plus the fan has a nice bright light which adds a lot of light to the dim bathroom.

The housing authorities want these properties in a certain condition and if your tenant is hard on the property it's going to make your life a pain in repairs and compliance.   

Yeah, back in my days of doing slews of redemptions I had 1 bank who was reliably a pain in the azz and never workable.

Propane on demand is a pain, takes too long for the hot water. 

@Martin BrownAlso the reality is if you are trying to forecast numbers, the second you hit enter they are wrong as nothing goes the way you modeled it.The important thing to consider when modeling is to have data as accurate as possible (garbage in garbage out), but most importantly (and this is where investors miss the boat), what is the sensitivity to the numbersFor example if doing a flip with hard money, which causes more pain - $20k more to complete, 25k less in sales price or getting the right number but it takes 3 months longer?

It's going to be very painful for all of us.

It is a pain but makes a difference. 

That is a pain to deal with.

That sounds like a major pain in the... pipes!