Absolutely hate it when managers give an estimate for an hour tasks to be completed in 7 days.. why can't they just accept they are shit and ask for the effort estimation from the concerned dev.. all the AGILity goes in an awry..

This, so much this.

Similar to @S-Homles - My company is rather small, and the CEO, and very often the PM too, come up with rather interesting overly-wrong estimations. The CEO once told me that he could have done what was an at least 2-weeks-sprint worth of stuff in only three days, on his own. He doesn't code since >20 years, it's difficult to smile and word politely why it can't be as he so wishes and believes. I too would totally pay him back if he was able to back up all his shitty estimations!