In the final version of the sequence, the Joker gets what he needs from Griggs through pure fear and intimidation, but apparently, during one take Jared Leto decided to take things a bit further.
The details of Jared Leto getting up close and personal came from a recent appearance by Ike Barinholtz on the Howard Stern Show.
Barinholtz says that initially he went with it and tried to improv the scene but eventually he had to stop when Leto added the line, “Did somebody piss their pants?”
In Suicide Squad the Joker is working on a way to free Harley Quinn and so he grabs Griggs, who is a security officer at the facility where the nano bombs that are keeping her in check are being produced.