Irritates me professionally when we're asked to do big infrastructure projects with practically no lead-time and the PI says "I will pay". This thinking betrays the belief that it is simply a matter of money.
Well it can be a matter of money, but often an order of magnitude more than they are thinking.
Every time. #sysadmin
Before leading with the fact you're willing to pay, you'd better be fucking sure you can afford our time.