[have the last laugh] or [get the last laugh] {v. phr.} […]

[he laughs best who laughs last] A person should go ahead […]

[laugh off] {v.} To dismiss with a laugh as not important […]

[laugh on the wrong side of one's mouth] or [laugh on […]

[laugh one out of] {v. phr.} To cause another to forget […]

[laugh one's head off] {v. phr.}, {informal} To laugh very hard; […]

[laugh up one's sleeve] or [laugh in one's sleeve] or [laugh […]