Unbelievably today is worse, if that's possible.
The grandfather of bad days:
I'm surviving on 3+ hours of sleep, am still at the customer's, and there's no end in sight.
No matter what time I sleep, I'll have to wake at 9am to make an apologetic phone call to another customer.
Tomorrow I've got 2 meetings scheduled, assuming I wrap up tonight's problem.
I'm public enemy #1 cos I'm redeploying my team all over the place to put out fires based on how critical they are. Unfortunately, this means some fires aren't attended to until some time later, and folks who get burnt are not happy.

If this carries on, tomorrow is going to be the Immortal of bad days.