It is the episode 'Just Harried' and it should be on the 4th disc, second episode...
Chat with our AI personalities
In 3x15 "Just Harried"
I do not know the name of the episode but I am pretty sure there is at least one episode were Leo tickles Piper.
Witch trial the frist episode of season 2
On the episode "A Call To Arms" Piper receives extra arms making her have 8. In this episode Piper and Leo receive powers of Hindu Gods. This is the first episode of season 7.
Forever Charmed, the series finale