what boys think girls do at sleepovers:

• patrol submerged during the daylight
• use the observation scope to look for funnel smoke and masts
• surface only after dusk to charge batteries
• only attack ships that stumble into range

what girls really do:

• daytime patrols surfaced with the periscope up, dgaf
• aggressively chase convoys and get right in the middle to fire bow and stern tubes
• play chicken with and torpedo destroyers head-on
• send a demolition team ashore to destroy a train