Four tickets to Interstellar in the city and a note that reads, "Know you've been wanting to see this. Should be fun. Invite whoever, you know I'm down. Happy Birthday, Billiam." There's a box beneath the tickets. Inside it there's a disassembled potato rocket launcher, an industrial potato shredder, and another note that reads, "And y'know, just in case. Gotta be prepared. Never know when potatoes will strike."