Saw this on /g/

worst-collatz-ever.py

n    = 1
sent = 1

def n_divide():
    global n 
    n = (n/2)

def n_add():
    global n
    n = ((3 * n) + 1)

def logic(): 
    global sent
    
    n = int(input("Please enter a number"))
    
    if (n == 1):
        print("Done")
        sent += 1
    
    else:
        if (n % 2 == 0):
        n_divide()
        
            if (n == 1):
                print("done")
                sent += 1
            
            else:
                logic()

    
        else:
            n_add()
            n_divide()
                if (n ==1):
                    print ("Done")
                    sent += 1

                else:
                    logic()

def menu():
    print("")
    print("Press 'r' to run.")
    print("Press 'q' to quit.")
    print("Press 'm' to access the menu.")
    print("")

def main():
    global sent
    while (sent != 0):
        menu()
        user = input("") 

        if r in user:
            logic()
        elif m in user:
            menu()
        elif q in user:
            sent = 0
        else:
            print("Invalid input")
            main()