POP........I tried to get a bubble typeface for the word pop as it is someting thats 'pops' however it is the 1st thing that comes to mind when I think 'pop' so it could end up to be too obviouss.

POP

-big

-blow up

-balloon

-jump

COMPRESS

-tight squeeze

-no spaces

COLIDE

-crash

-techtonic plates

-head on collision