Even if, as the Dr says, bonds rarely hold up in court, you really need a very strong reason to break one. Simply being pissed-off with the company is no excuse - most pilots suffer from this malaise at times. To get out with any shred of honour you would need to take them on for some clear breach of their side of any agreement, and show that you had objected to whatever the breach was, but to no avail. Examples could be illegal rostering, repeated late payment of salary or allowances, failure to provide a safe working environment etc.
Or you could deliberately fail a check ride, or tell the boss what you think of him at the Xmas party (or roger his missus) of course. But when your next potential employer does due diligence, all but the last of these tactics would likely bite you on the bum just as bad as jumping the bond.