Sabotage - to alter a plan or event.
programme
perhaps "smash".
wreck smash break spoil
I've is a word that means I have. I'll is a word that means I will.
Desperate is the word that means willing to do anything.
rock the boat? really more of a phrase than a word...
demolish
"Rock the boat."
Yes, it means to ruin something through clumsiness.
programme
The word you are looking for is "conspire". It means to plan something secretly with others.
I will not ruin your painting.
the adjective of ruin
A sabatoge
poo hill
design
perhaps "smash".