For all I know, the instrument in the case isn’t a cello. I’d imagine that carting it around would make me a bit grumpy too. You have to admire anyone who’s dedicated enough to carry something that large around. Despite the love of music, there would have to be days that the burden would get to you a bit.
Antsketchblog 
Ain’t that the truth. I have a friend who plays the double bass. I mean, they have to choose what car they buy based on the size of their instrument!
Maybe they could consider changing instruments. Some of these look pretty cool
http://mattiasa.blogspot.com/2009/04/musical-instruments-of-enlightenment.html